Fix compiling issue

img-view.c: In function 'real_view_window_new':
img-view.c:889: error: 'for' loop initial declarations are only allowed in C99 mode
img-view.c:889: note: use option -std=c99 or -std=gnu99 to compile your code

src/img-view.c

@@ -886,7 +886,8 @@ static ViewWindow *real_view_window_new(FileData *fd, GList *list, CollectionDat
 		}
 
 	/* Wait until image is loaded otherwise size is not defined */
-	for (int count = 10; count && !w && !h; count++)
+	int count;
+	for (count = 10; count && !w && !h; count++)
 		{
 		image_get_image_size(vw->imd, &w, &h);
 		usleep(100000);