r45367 snapshot

Gtk3: generate gdk-pixbuf's `loader.cache` from loaders in bindist

Point `gdk-pixbuf-query-loaders` to the win32 bindist's `lib/gdk-pixbuf-2.0/2.10.0/` directory to
generate a proper `loaders.cache` file from the pixbuf loaders we've copied into the bindist.
Might fix bug #2081. 


git-svn-id: https://svn.code.sf.net/p/vice-emu/code/trunk@45367 379a1393-f5fb-40a0-bcee-ef074d9b53f7