Reorganize vector constants to work around gcc 4.1 bug:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27006

This bug caused certain movies (444P or RGB/BGR-based) to become brighter
and more purple when played on a YV12 vo.

Originally committed as revision 18047 to svn://svn.mplayerhq.hu/mplayer/trunk/postproc

postproc/swscale_altivec_template.c

@@ -26,14 +26,13 @@
 #define AVV(x...) {x}
 #endif
 
-static const vector signed int vzero =
-  (const vector signed int)AVV(0, 0, 0, 0);
-static const vector unsigned int altivec_vectorShiftInt19 =
-  (const vector unsigned int)AVV(19, 19, 19, 19);
+#define vzero vec_splat_s32(0)
 
 static inline void
 altivec_packIntArrayToCharArray(int *val, uint8_t* dest, int dstW) {
   register int i;
+  vector unsigned int altivec_vectorShiftInt19 =
+    vec_add(vec_splat_u32(10),vec_splat_u32(9));
   if ((unsigned long)dest % 16) {
     /* badly aligned store, we force store alignement */
     /* and will handle load misalignement on val w/ vec_perm */