maintainer-feedback requested: [Bug 239782] multimedia/ffmpeg: fix build on powerpc64 with clang

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Bug 239782: multimedia/ffmpeg: fix build on powerpc64 with clang
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239782



--- Description ---
Clang needs a fix from
https://ffmpeg.org/pipermail/ffmpeg-devel/2019-August/247682.html to compile
ffmpeg with Altivec. Since VSX is supported only in little-endian variant, we
only need a patch for libswscale/ppc/swscale_altivec.c.