select apk from binary path, not cwd

[miraclx]

In the case that the GNIREHTET_APK env is unset, the default gnirehtet.apk file should be correctly referenced as being in the same folder as the binary itself. Instead of the current behavior of checking the current working directory.

This is implemented to be able to traverse links, so you can have symbolic links to the binary without equally linking the APK.