Fix `Error: file has no ‘lexical-binding’ directive on its first line` in build-snapshot

[alexott]

See run https://github.com/dimitri/el-get/actions/runs/10979974809/job/30485148976?pr=2959, also related to #2881

In toplevel form:
el-get-autoloading.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
el-get-autoloading.el:16:11: Error: Package autoload is deprecated

In toplevel form:
el-get-build.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
el-get-build.el:16:11: Error: Package autoload is deprecated

In toplevel form:
el-get-bundle.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
el-get-bundle.el:13:11: Error: Package autoload is deprecated

In toplevel form:
el-get-byte-compile.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
el-get-byte-compile.el:64:9: Error: reference to free variable ‘el-get-byte-compile’

In toplevel form:
el-get-check.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
el-get-check.el:23:11: Error: Package autoload is deprecated

In toplevel form:
el-get-core.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
el-get-core.el:25:11: Error: Package autoload is deprecated

In toplevel form:
el-get-custom.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
el-get-custom.el:25:11: Error: Package autoload is deprecated

In toplevel form:
el-get-dependencies.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
el-get-dependencies.el:16:11: Error: Package autoload is deprecated

In toplevel form:
el-get-install.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line

In toplevel form:
el-get-list-packages.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
el-get-list-packages.el:19:11: Error: Package autoload is deprecated

In toplevel form:
el-get-methods.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
el-get-methods.el:16:11: Error: Package autoload is deprecated

In toplevel form:
el-get-notify.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
el-get-notify.el:15:11: Error: Package autoload is deprecated

In toplevel form:
el-get-recipes.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
el-get-recipes.el:27:11: Error: Package autoload is deprecated

In toplevel form:
el-get-status.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
el-get-status.el:24:11: Error: Package autoload is deprecated

In toplevel form:
el-get.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
el-get.el:183:11: Error: Package autoload is deprecated

In toplevel form:
methods/el-get-apt-get.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
methods/el-get-apt-get.el:15:11: Error: Package autoload is deprecated

In toplevel form:
methods/el-get-brew.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
methods/el-get-brew.el:15:11: Error: Package autoload is deprecated

In toplevel form:
methods/el-get-builtin.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
methods/el-get-builtin.el:15:11: Error: Package autoload is deprecated

In toplevel form:
methods/el-get-bzr.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
methods/el-get-bzr.el:15:11: Error: Package autoload is deprecated

In toplevel form:
methods/el-get-cvs.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
methods/el-get-cvs.el:15:11: Error: Package autoload is deprecated

In toplevel form:
methods/el-get-darcs.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
methods/el-get-darcs.el:15:11: Error: Package autoload is deprecated

In toplevel form:
methods/el-get-elpa.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
methods/el-get-elpa.el:16:11: Error: Package autoload is deprecated

In toplevel form:
methods/el-get-emacsmirror.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
methods/el-get-emacsmirror.el:16:11: Error: Package autoload is deprecated

In toplevel form:
methods/el-get-emacswiki.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
methods/el-get-emacswiki.el:16:11: Error: Package autoload is deprecated

In toplevel form:
methods/el-get-fink.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
methods/el-get-fink.el:15:11: Error: Package autoload is deprecated

In toplevel form:
methods/el-get-fossil.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
methods/el-get-fossil.el:16:11: Error: Package autoload is deprecated

In toplevel form:
methods/el-get-git-svn.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
methods/el-get-git-svn.el:15:11: Error: Package autoload is deprecated

In toplevel form:
methods/el-get-git.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
methods/el-get-git.el:16:11: Error: Package autoload is deprecated

In toplevel form:
methods/el-get-github-tar.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
methods/el-get-github-tar.el:15:11: Error: Package autoload is deprecated

In toplevel form:
methods/el-get-github-zip.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
methods/el-get-github-zip.el:15:11: Error: Package autoload is deprecated

In toplevel form:
methods/el-get-github.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
methods/el-get-github.el:16:11: Error: Package autoload is deprecated

In toplevel form:
methods/el-get-go.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
methods/el-get-go.el:15:11: Error: Package autoload is deprecated

In toplevel form:
methods/el-get-hg.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
methods/el-get-hg.el:15:11: Error: Package autoload is deprecated

In toplevel form:
methods/el-get-http-tar.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
methods/el-get-http-tar.el:16:11: Error: Package autoload is deprecated

In toplevel form:
methods/el-get-http-zip.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
methods/el-get-http-zip.el:16:11: Error: Package autoload is deprecated

In toplevel form:
methods/el-get-http.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
methods/el-get-http.el:15:11: Error: Package autoload is deprecated

In toplevel form:
methods/el-get-pacman.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
methods/el-get-pacman.el:15:11: Error: Package autoload is deprecated

In toplevel form:
methods/el-get-svn.el:1:1: Error: file has no ‘lexical-binding’ directive on its first line
methods/el-get-svn.el:15:11: Error: Package autoload is deprecated