consistency cosmetics: Rename POWERPC identifiers to PPC.

Originally committed as revision 28194 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale

libswscale/swscale.c

@@ -949,11 +949,11 @@ static inline void yuv2rgbXinC_full(SwsContext *c, int16_t *lumFilter, int16_t *
 #define COMPILE_C
 #endif
 
-#ifdef ARCH_POWERPC
+#ifdef ARCH_PPC
 #if (defined (HAVE_ALTIVEC) || defined (RUNTIME_CPUDETECT)) && defined (CONFIG_GPL)
 #define COMPILE_ALTIVEC
 #endif //HAVE_ALTIVEC
-#endif //ARCH_POWERPC
+#endif //ARCH_PPC
 
 #if defined(ARCH_X86)
 
@@ -1628,7 +1628,7 @@ static SwsFunc getSwsFunc(int flags){
         return swScale_C;
 
 #else
-#ifdef ARCH_POWERPC
+#ifdef ARCH_PPC
     if (flags & SWS_CPU_CAPS_ALTIVEC)
         return swScale_altivec;
     else