Re-enable mad decoder on OSX. It was disabled because it was a CPU hog, but...

Re-enable mad decoder on OSX. It was disabled because it was a CPU hog, but the issue seems to no longer be a problem

modules/codec/mpeg_audio.c

@@ -106,7 +106,7 @@ vlc_module_begin();
     set_description( _("MPEG audio layer I/II/III decoder") );
     set_category( CAT_INPUT );
     set_subcategory( SUBCAT_INPUT_ACODEC );
-#if defined(__APPLE__) || defined(UNDER_CE)
+#if defined(UNDER_CE)
    set_capability( "decoder", 5 );
 #else
     set_capability( "decoder", 100 );