patch from Martin Decky <deckm1am@ss1000.ms.mff.cuni.cz> applied and unnecassery "memory" removed

Originally committed as revision 2535 to svn://svn.mplayerhq.hu/mplayer/trunk/postproc

postproc/swscale.c

@@ -1436,8 +1436,11 @@ else				s_xinc2= s_xinc;
 	g16Dither2= g16Dither;
 #endif
   }
-__asm __volatile(SFENCE:::"memory");
+
-__asm __volatile(EMMS:::"memory");
+#ifdef HAVE_MMX
+	__asm __volatile(SFENCE:::"memory");
+	__asm __volatile(EMMS);
+#endif
 }
 
 

postproc/swscale_template.c

@@ -1436,8 +1436,11 @@ else				s_xinc2= s_xinc;
 	g16Dither2= g16Dither;
 #endif
   }
-__asm __volatile(SFENCE:::"memory");
+
-__asm __volatile(EMMS:::"memory");
+#ifdef HAVE_MMX
+	__asm __volatile(SFENCE:::"memory");
+	__asm __volatile(EMMS);
+#endif
 }