use webkit2gtk-4.1 when available and 4.0 as fallback

This is derived from 7ac8805 by oreo639 <[email protected]>,
but only the part necessary after 4c76a4c.

Author: oreo639

CMakeLists.txt

@@ -95,7 +95,10 @@ endif()
 
 pkg_check_modules (GTKMM3     REQUIRED  gtkmm-3.0>=3.10)
 pkg_check_modules (GLIBMM2    REQUIRED  glibmm-2.4)
-pkg_check_modules (WEBKIT2GTK REQUIRED  webkit2gtk-4.0>=2.22)
+pkg_check_modules (WEBKIT2GTK webkit2gtk-4.1)
+if (NOT WEBKIT2GTK_FOUND)
+  pkg_check_modules (WEBKIT2GTK REQUIRED webkit2gtk-4.0>=2.22)
+endif ()
 pkg_check_modules (SASS       REQUIRED  libsass)
 pkg_check_modules (GIOMM2     REQUIRED  giomm-2.4)
 pkg_check_modules (GIOUNIX    REQUIRED  gio-unix-2.0>=2.16)