Simplify mm_support() for ARM (by Måns).

Originally committed as revision 14033 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/armv4l/dsputil_arm.c

@@ -205,11 +205,7 @@ static void simple_idct_ipp_add(uint8_t *dest, int line_size, DCTELEM *block)
 
 int mm_support(void)
 {
-    int result = 0;
-#ifdef HAVE_IWMMXT
-    result |= MM_IWMMXT;
-#endif /* result */
-    return result;
+    return ENABLE_IWMMXT * MM_IWMMXT;
 }
 
 void dsputil_init_armv4l(DSPContext* c, AVCodecContext *avctx)