ffmpeg: update to 3.2.7

ffmpeg: update to 3.2.7

Removes the x86 optimization disables from the SOFT_FLOAT portion. There are no i386 profiles that do
not use hard float, so these options accomplish nothing.

Target-os=linux rules out dxva2 and vda, so disable statements are unnecessary.

For x86-64 users of libffmpeg-full, optimize around performance instead of size.

Remove patented flag requirement from mp2 and mp3 audio files in libffmpeg-custom per expiration.

Tidies up some of the configure steps where only one option is being changed or cosmetic consistency.

Signed-off-by: Ian Leonard <antonlacon@gmail.com>