Update x264 presets. Patch by Lou Logan <lou@fakeoutdoorsman.com>

Originally committed as revision 23879 to svn://svn.ffmpeg.org/ffmpeg/trunk

ffpresets/libx264-superfast.ffpreset

@@ -20,3 +20,4 @@ directpred=1
 trellis=0
 flags2=+bpyramid-mixed_refs+wpred+dct8x8+fastpskip-mbtree
 wpredp=0
+rc_lookahead=0

ffpresets/libx264-superfast_firstpass.ffpreset

@@ -20,3 +20,4 @@ directpred=1
 trellis=0
 flags2=+bpyramid-mixed_refs+wpred-dct8x8+fastpskip-mbtree
 wpredp=0
+rc_lookahead=0

ffpresets/libx264-ultrafast.ffpreset

@@ -21,3 +21,4 @@ trellis=0
 flags2=-bpyramid-mixed_refs-wpred-dct8x8+fastpskip-mbtree
 wpredp=0
 aq_mode=0
+rc_lookahead=0

ffpresets/libx264-ultrafast_firstpass.ffpreset

@@ -21,3 +21,4 @@ trellis=0
 flags2=-bpyramid-mixed_refs-wpred-dct8x8+fastpskip-mbtree
 wpredp=0
 aq_mode=0
+rc_lookahead=0

ffpresets/libx264-veryfast.ffpreset

@@ -18,5 +18,6 @@ bf=3
 refs=1
 directpred=1
 trellis=0
-flags2=+bpyramid-mixed_refs+wpred+dct8x8+fastpskip-mbtree
+flags2=+bpyramid-mixed_refs+wpred+dct8x8+fastpskip
 wpredp=0
+rc_lookahead=10

ffpresets/libx264-veryfast_firstpass.ffpreset

@@ -18,5 +18,6 @@ bf=3
 refs=1
 directpred=1
 trellis=0
-flags2=+bpyramid-mixed_refs+wpred-dct8x8+fastpskip-mbtree
+flags2=+bpyramid-mixed_refs+wpred-dct8x8+fastpskip
 wpredp=0
+rc_lookahead=10