Switch to upstream-freebsd for the unmolested wchar code.

Change-Id: I87b4d76ff8da04109ae53638eec4f11629798960

libc/include/wchar.h

@@ -149,6 +149,11 @@ typedef void *wctrans_t;
 extern wint_t		 towctrans(wint_t, wctrans_t);
 extern wctrans_t	 wctrans (const char *);
 
+#if _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
+wchar_t* wcsdup(const wchar_t*);
+size_t wcsnlen(const wchar_t*, size_t);
+#endif
+
 __END_DECLS
 
 #endif /* _WCHAR_H_ */