Remove reference to not anymore existing symbol has_altivec and use

mm_support instead.

Fix compilation if altivec is present and libxvidff.c is compiled.

Originally committed as revision 25075 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/libxvidff.c

@@ -31,6 +31,7 @@
 #include <xvid.h>
 #include <unistd.h>
 #include "avcodec.h"
+#include "dsputil.h"
 #include "libavutil/intreadwrite.h"
 #include "libxvid_internal.h"
 #if !HAVE_MKSTEMP
@@ -44,9 +45,6 @@
 #define BUFFER_REMAINING(x)         (BUFFER_SIZE - strlen(x))
 #define BUFFER_CAT(x)               (&((x)[strlen(x)]))
 
-/* For PPC Use */
-int has_altivec(void);
-
 /**
  * Structure for the private Xvid context.
  * This stores all the private context for the codec.
@@ -215,7 +213,7 @@ static av_cold int xvid_encode_init(AVCodecContext *avctx)  {
 #if ARCH_PPC
     /* Xvid's PPC support is borked, use libavcodec to detect */
 #if HAVE_ALTIVEC
-    if( has_altivec() ) {
+    if (mm_support() & AV_CPU_FLAG_ALTIVEC) {
         xvid_gbl_init.cpu_flags = XVID_CPU_FORCE | XVID_CPU_ALTIVEC;
     } else
 #endif