autotools, darwin: restrict -force_cpusubtype_ALL switch to powerpc only

[sezero]

Fixes: #107
Fixes: #108
(See also: mkxp-z/mkxp-z#200)

[Splendide-Imaginarius]

Thanks for fixing this. This GitHub repo hasn't gotten any commits in 3 years. Maybe try submitting this fix to https://gitlab.xiph.org/xiph/vorbis (last commit was a month ago)?

[sezero]

This GitHub repo hasn't gotten any commits in 3 years. Maybe try submitting this fix to https://gitlab.xiph.org/xiph/vorbis (last commit was a month ago)?

I don't intend to, at the moment. But if you can post a notifier at there, please do so.

[sezero]

Thanks for fixing this. This GitHub repo hasn't gotten any commits in 3 years. Maybe try submitting this fix to https://gitlab.xiph.org/xiph/vorbis (last commit was a month ago)?

https://gitlab.xiph.org/xiph/vorbis/-/issues/2352

[Splendide-Imaginarius]

@sezero Is it likely that SDL_mixer will pull in this fix if upstream doesn't review your PR?

[sezero]

@sezero Is it likely that SDL_mixer will pull in this fix if upstream doesn't review your PR?

I can apply it to SDL's vendored libvorbis, but when SDL_mixer is built in vendored mode it uses cmake and not autotools (the issue and the fix is autotools-only), therefore no point in that...