swscale/rgb2rgb : cosmetic, move shuffle_bytes func declaration

move shuffle_bytes_1230, 3012, 3210 with the other shuffle_byte
declaration

libswscale/rgb2rgb.h

@@ -52,6 +52,9 @@ extern void (*rgb32tobgr15)(const uint8_t *src, uint8_t *dst, int src_size);
 
 extern void (*shuffle_bytes_0321)(const uint8_t *src, uint8_t *dst, int src_size);
 extern void (*shuffle_bytes_2103)(const uint8_t *src, uint8_t *dst, int src_size);
+extern void (*shuffle_bytes_1230)(const uint8_t *src, uint8_t *dst, int src_size);
+extern void (*shuffle_bytes_3012)(const uint8_t *src, uint8_t *dst, int src_size);
+extern void (*shuffle_bytes_3210)(const uint8_t *src, uint8_t *dst, int src_size);
 
 void rgb64tobgr48_nobswap(const uint8_t *src, uint8_t *dst, int src_size);
 void   rgb64tobgr48_bswap(const uint8_t *src, uint8_t *dst, int src_size);
@@ -76,10 +79,6 @@ void rgb15tobgr15(const uint8_t *src, uint8_t *dst, int src_size);
 void rgb12tobgr12(const uint8_t *src, uint8_t *dst, int src_size);
 void    rgb12to15(const uint8_t *src, uint8_t *dst, int src_size);
 
-extern void (*shuffle_bytes_1230)(const uint8_t *src, uint8_t *dst, int src_size);
-extern void (*shuffle_bytes_3012)(const uint8_t *src, uint8_t *dst, int src_size);
-extern void (*shuffle_bytes_3210)(const uint8_t *src, uint8_t *dst, int src_size);
-
 void ff_rgb24toyv12_c(const uint8_t *src, uint8_t *ydst, uint8_t *udst,
                       uint8_t *vdst, int width, int height, int lumStride,
                       int chromStride, int srcStride, int32_t *rgb2yuv);