Rename "overrides" to "custom."

This helps shift the emphasis from "replacing existing files" to "adding
missing files," without ruling either option out.

project/lib/custom/ogg/include/ogg/config_types.h

@@ -0,0 +1,13 @@
+#ifndef __CONFIG_TYPES_H__
+#define __CONFIG_TYPES_H__
+
+#include <inttypes.h>
+
+typedef int16_t ogg_int16_t;
+typedef uint16_t ogg_uint16_t;
+typedef int32_t ogg_int32_t;
+typedef uint32_t ogg_uint32_t;
+typedef int64_t ogg_int64_t;
+typedef uint64_t ogg_uint64_t;
+
+#endif