picture_tools_enc: fix windows build warning
with WebPReplaceTransparentPixels() function signature:
src\enc\picture_tools_enc.c(86): warning C4028: formal parameter 1
different from declaration
@@ -83,7 +83,7 @@ static int SmoothenBlock(const uint8_t* a_ptr, int a_stride, uint8_t* y_ptr,
return (count == 0);
}
-void WebPReplaceTransparentPixels(WebPPicture* pic, uint32_t color) {
+void WebPReplaceTransparentPixels(WebPPicture* const pic, uint32_t color) {
if (pic != NULL && pic->use_argb) {
int y = pic->height;
uint32_t* argb = pic->argb;
