- MFB: fix compiler warnings

ext/filter/sanitizing_filters.c

@@ -303,13 +303,13 @@ void php_filter_number_float(PHP_INPUT_FILTER_PARAM_DECL)
 
 	/* depending on flags, strip '.', 'e', ",", "'" */
 	if (flags & FILTER_FLAG_ALLOW_FRACTION) {
-		filter_map_update(&map, 2, (unsigned char *) ".");
+		filter_map_update(&map, 2, (const unsigned char *) ".");
 	}
 	if (flags & FILTER_FLAG_ALLOW_THOUSAND) {
-		filter_map_update(&map, 3,  (unsigned char *) ",");
+		filter_map_update(&map, 3,  (const unsigned char *) ",");
 	}
 	if (flags & FILTER_FLAG_ALLOW_SCIENTIFIC) {
-		filter_map_update(&map, 4,  (unsigned char *) "eE");
+		filter_map_update(&map, 4,  (const unsigned char *) "eE");
 	}
 	filter_map_apply(value, &map);
 }