Disable C code when compiling AltiVec code, fixes the warning:

swscale_template.c:2623: warning: `swScale_C' defined but not used

Originally committed as revision 28352 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale

libswscale/swscale.c

@@ -961,6 +961,7 @@ static inline void yuv2rgbXinC_full(SwsContext *c, int16_t *lumFilter, int16_t *
 
 #if ARCH_PPC
 #if (HAVE_ALTIVEC || defined (RUNTIME_CPUDETECT)) && CONFIG_GPL
+#undef COMPILE_C
 #define COMPILE_ALTIVEC
 #endif
 #endif //ARCH_PPC