Hi,

I've modified the package definition and patch a bit to
make it simpler (visualboyadvance-m-fix-rpath.patch now only removed
things), cross-compilable (it uses cc-for-target instead of hardcoding
"gcc" and LIBRARY_PATH is unused) and avoid using constructs that
are being deprecated (%build-inputs --> this-package-input).

The list+local-file will have to be replaced by search-patches.

Cross-compilation is untested because gtk+ cannot currently be
cross-compiled.

It seems to work, at least the application starts, I don't have any VBA
games to test it with.

Greetings,
Maxime.