dec_video: remove emms usage

libavcodec generally shouldn't have this problem anymore (if libavcodec
ever had it). All other video decoders are gone. In any case, if this
commit actually causes regressions, these are libavcodec bugs and should
be fixed there instead.

video/decode/dec_video.c

@@ -47,8 +47,6 @@
 
 // ===================================================================
 
-#include "core/cpudetect.h"
-
 int field_dominance = -1;
 
 int divx_quality = 0;
@@ -315,14 +313,6 @@ void *decode_video(sh_video_t *sh_video, struct demux_packet *packet,
 
     //------------------------ frame decoded. --------------------
 
-#if HAVE_MMX
-    // some codecs are broken, and doesn't restore MMX state :(
-    // it happens usually with broken/damaged files.
-    if (gCpuCaps.hasMMX) {
-        __asm__ volatile("emms\n\t":::"memory");
-    }
-#endif
-
     if (!mpi || drop_frame) {
         talloc_free(mpi);
         return NULL;            // error / skipped frame