git: correct utf-16 and utf-32 conversion on musl
git: correct utf-16 and utf-32 conversion on musl

musl's iconv treats utf-{16,32} encoding as utf-{16,32}be,
without BOM, correctly according to POSIX.

However, most tools out there think differently.

Change the build flag for the musl system to fix it.

Together with my patch here:
https://github.com/git/git/commit/840c40cea11290d40fd455cc3b23d5793056f4d4

git's test: t0028 should be fine now.

necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages