x264: update to latest revision on official git

x264: update to latest revision on official git

The mirror was out of date; meanwhile x264 remains in active development.

Drop unsuitable x32 patch and declare x264 incompatible with the target
(by every sign it's an extinct target; if not so please work with upstream
to develop a solution there).

Replace don-t-default-to-cortex-a9-with-neon.patch with a configure
option passing in target compiler options so that configure can make
correct decisions and we don't have to patch it.

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>