Remove the unused function roundToInt16. It is a duplicate of the same function

in swscale.c. Fixes the warning:
yuv2rgb_altivec.c:751: 'roundToInt16' defined but not used

Originally committed as revision 26247 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale

libswscale/yuv2rgb_altivec.c

@@ -748,13 +748,6 @@ SwsFunc yuv2rgb_init_altivec (SwsContext *c)
     return NULL;
 }
 
-static uint16_t roundToInt16(int64_t f){
-    int r= (f + (1<<15))>>16;
-         if (r<-0x7FFF) return 0x8000;
-    else if (r> 0x7FFF) return 0x7FFF;
-    else                return r;
-}
-
 void yuv2rgb_altivec_init_tables (SwsContext *c, const int inv_table[4],int brightness,int contrast, int saturation)
 {
     union {