Bump x264 to r2200-999b753.

- H.264 Level 5.2 support.

- Threaded lookahead: improved encoding speed with very fast settings, on systems with 8 processor "threads" or more.

'By default, lookahead threads are 1/6 of regular threads.  This isn't exacting,
but it seems to work well for all presets on real systems.  With sliced-threads,
it's the same as the number of encoding threads.'

Mini-benchmark:
---------------

2.2 GHz Intel Core i7, 8 processor threads (4 physical cores + 4 virtual cores), Mac OS X 10.7.4. HandBrake's "Normal" preset.

libavcodec decoding threads: 8 / 2 + 1 =  5

x264 encoding threads:       8 * 3 / 2 = 12

x264 lookahead threads:      12 / 6    =  2

Blu-ray, H.264, 1920x1080 -> 1920x800

~48 fps with threaded lookahead, ~42 fps without

DVD, MPEG-2, 720x576 -> 720x576

~224 fps with threaded lookahead, ~192 fps without 



git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@4704 b64f7644-9d1e-0410-96f1-a4d463321fa5

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