x264: allow b-pyramid in main-profile selection

5cc3984f92754e1fd3643039354f8f00c324a90c was too strict, and for baseline it
should be only cosmetic change.

modules/codec/x264.c

@@ -1188,9 +1188,6 @@ static int  Open ( vlc_object_t *p_this )
         {
             msg_Dbg( p_enc, "Limiting to main-profile");
             p_sys->param.analyse.b_transform_8x8 = 0;
-#if X264_BUILD >= 78
-            p_sys->param.i_bframe_pyramid = X264_B_PYRAMID_NONE;
-#endif
         }
         /* high profile don't restrict stuff*/
     }