package/x264: Fix aarch64 support, bump version

package/x264: Fix aarch64 support, bump version

The current x264 revision fails to include asm code from common/aarch64
which is needed by packages linking to x264, like ffmpeg:

Quoting http://autobuild.buildroot.net/results/189/189f215bcbc510cd292c0f337fe6b39979f01813//ffmpeg-2.7.2/config.log

/home/test/autobuild/instance-3/output/host/usr/aarch64-buildroot-linux-gnu/sysroot/usr/lib/libx264.so:
 undefined reference to `x264_deblock_h_chroma_422_intra_neon'

Function "chroma_422_intra_neon" is defined in
x264/common/aarch64/deblock-a.S. The code in
x264/common/aarch64/* is only compiled if an
assembler was found:
http://git.videolan.org/?p=x264.git;a=blob;f=Makefile;h=6193c5936939fda36f9a2e00c734223318ccda14;hb=HEAD#l134

To allow this add BR2_aarch64 as an assembler-enabled arch.

This however breaks compilation due to broken NEON detection:
"no NEON support, try adding -mfpu=neon to CFLAGS
If you really want to run on such a CPU, configure with --disable-asm."

The bug was fixed upstream Jul, 25th, 2015:
http://git.videolan.org/?p=x264.git;a=commit;h=73ae2d11d472d0eb3b7c218dc1659db32f649b14

When we already have to do a version bump let's take the latest one ;)

Fixes
http://autobuild.buildroot.net/results/90a/90ae4b2fa8a6cff0f18abea2b1c45282afe99e4b/
http://autobuild.buildroot.net/results/109/109686cbc8327e62f757db576cfff49c490b52ae/
http://autobuild.buildroot.net/results/189/189f215bcbc510cd292c0f337fe6b39979f01813/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>