libx264: handle closed GOP codec flag

Also update libx264 presets to keep closed gop as default.

Signed-off-by: Jindrich Makovicka <makovick@gmail.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>

configure

@@ -2891,8 +2891,8 @@ enabled libvpx     && {
     enabled libvpx_encoder && { check_lib2 "vpx/vpx_encoder.h vpx/vp8cx.h" vpx_codec_enc_init_ver -lvpx ||
                                 die "ERROR: libvpx encoder version must be >=0.9.1"; } }
 enabled libx264    && require  libx264 x264.h x264_encoder_encode -lx264 &&
-                      { check_cpp_condition x264.h "X264_BUILD >= 99" ||
-                        die "ERROR: libx264 version must be >= 0.99."; }
+                      { check_cpp_condition x264.h "X264_BUILD >= 115" ||
+                        die "ERROR: libx264 version must be >= 0.115."; }
 enabled libxavs    && require  libxavs xavs.h xavs_encoder_encode -lxavs
 enabled libxvid    && require  libxvid xvid.h xvid_global -lxvidcore
 enabled mlib       && require  mediaLib mlib_types.h mlib_VectorSub_S16_U8_Mod -lmlib

ffpresets/libx264-fast.ffpreset

@@ -1,5 +1,5 @@
 coder=1
-flags=+loop
+flags=+loop+cgop
 cmp=+chroma
 partitions=+parti8x8+parti4x4+partp8x8+partb8x8
 me_method=hex

ffpresets/libx264-fast_firstpass.ffpreset

@@ -1,5 +1,5 @@
 coder=1
-flags=+loop
+flags=+loop+cgop
 cmp=+chroma
 partitions=-parti8x8-parti4x4-partp8x8-partb8x8
 me_method=dia

ffpresets/libx264-faster.ffpreset

@@ -1,5 +1,5 @@
 coder=1
-flags=+loop
+flags=+loop+cgop
 cmp=+chroma
 partitions=+parti8x8+parti4x4+partp8x8+partb8x8
 me_method=hex

ffpresets/libx264-faster_firstpass.ffpreset

@@ -1,5 +1,5 @@
 coder=1
-flags=+loop
+flags=+loop+cgop
 cmp=+chroma
 partitions=-parti8x8-parti4x4-partp8x8-partb8x8
 me_method=dia

ffpresets/libx264-lossless_fast.ffpreset

@@ -1,5 +1,5 @@
 coder=0
-flags=+loop
+flags=+loop+cgop
 cmp=+chroma
 partitions=-parti8x8+parti4x4+partp8x8-partp4x4-partb8x8
 me_method=hex

ffpresets/libx264-lossless_max.ffpreset

@@ -1,5 +1,5 @@
 coder=1
-flags=+loop
+flags=+loop+cgop
 cmp=+chroma
 partitions=+parti8x8+parti4x4+partp8x8+partp4x4-partb8x8
 me_method=esa

ffpresets/libx264-lossless_medium.ffpreset

@@ -1,5 +1,5 @@
 coder=1
-flags=+loop
+flags=+loop+cgop
 cmp=+chroma
 partitions=-parti8x8+parti4x4+partp8x8+partp4x4-partb8x8
 me_method=hex

ffpresets/libx264-lossless_slow.ffpreset

@@ -1,5 +1,5 @@
 coder=1
-flags=+loop
+flags=+loop+cgop
 cmp=+chroma
 partitions=+parti8x8+parti4x4+partp8x8+partp4x4-partb8x8
 me_method=umh

ffpresets/libx264-lossless_slower.ffpreset

@@ -1,5 +1,5 @@
 coder=1
-flags=+loop
+flags=+loop+cgop
 cmp=+chroma
 partitions=+parti8x8+parti4x4+partp8x8+partp4x4-partb8x8
 me_method=umh