media-video/ffmpeg: explicitly pass --arch=arm for arm32

When not cross-compiling, `uname -m` is used to detect the arch
but this may be wrong for a arm64 kernel with arm32 userspace.
Normally mismatching kernel and userspace should rely on setarch
or linux32, but seems that there are users that use that without
a container/chroot.

This isn't needed for x86 given ffmpeg sees x86_64 and _32 as the
same thing (and we disable asm for bizarro x32), while for arm
it'll use the wrong asm.

Alternatively we could move --arch=$(tc-arch-kernel) out of the
cross condition -- albeit I'm not 100% sure that's always correct
given that's meant for the kernel and not ffmpeg, and it could be
adjusted based on kernel changes too. Ideally we should do our
own translation based on ARCH_LIST in ./configure, but I'd rather
not touch this further at this time.

Closes: https://bugs.gentoo.org/969514
Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

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