MVK: enable avcodec-fast on 32bit iOS devices only

64bit devices should be powerful enough to decode the fullset of mp2v contents

Sources/VLCLibrary.m

@@ -104,8 +104,10 @@ static VLCLibrary * sharedLibrary = nil;
                       @"--no-stats",
                       @"--no-snapshot-preview",
 #ifndef NOSCARYCODECS
+#ifndef __LP64__
                       @"--avcodec-fast",
 #endif
+#endif
                       @"--text-renderer=freetype",
                       @"--avi-index=3"];
     }