Windows: Create GTK bundle for x86_64 and suppt non-native execution
Changes in the bundle creation script:
- the GTK (and other dependencies) bundle is now created for the x86_64
platform
- the new parameter "-x" allows to run script on a Linux system using
Wine, therefore it is necessary to run the post-install scripts after
all packages have been extracted.
- use "-Sdd" for Pacman to ignore dependencies as we resolve them
manually
- do not use "tar -x --xz" as Pacman nowadays also downloads .zst
packages, instead just download the file and let tar choose the format
automatically based on the filename
- install grep with Pacman as the build and target platform are now
identical
- update GTK dependencies to match current packages