sws/"rgb2rgb": drop RGB2YUV_SHIFT

Fixes a warning and increases the precission the coefficients

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libswscale/rgb2rgb.c

@@ -105,7 +105,6 @@ void (*yuyvtoyuv422)(uint8_t *ydst, uint8_t *udst, uint8_t *vdst,
                      const uint8_t *src, int width, int height,
                      int lumStride, int chromStride, int srcStride);
 
-#define RGB2YUV_SHIFT 8
 #define BY ((int)( 0.098 * (1 << RGB2YUV_SHIFT) + 0.5))
 #define BV ((int)(-0.071 * (1 << RGB2YUV_SHIFT) + 0.5))
 #define BU ((int)( 0.439 * (1 << RGB2YUV_SHIFT) + 0.5))