Fix for issue #127

- set stb_image flags so that it loads correct data in iPhone

src/nanovg.c

@@ -698,7 +698,10 @@ void nvgFillPaint(struct NVGcontext* ctx, struct NVGpaint paint)
 int nvgCreateImage(struct NVGcontext* ctx, const char* filename)
 {
 	int w, h, n, image;
-	unsigned char* img = stbi_load(filename, &w, &h, &n, 4);
+	unsigned char* img;
+	stbi_set_unpremultiply_on_load(1);
+	stbi_convert_iphone_png_to_rgb(1);
+	img = stbi_load(filename, &w, &h, &n, 4);
 	if (img == NULL) {
 //		printf("Failed to load %s - %s\n", filename, stbi_failure_reason());
 		return 0;