src: remove unused locale.h

This commit removes the locale.h header as it does not look like it is
used.

PR-URL: #23120
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: danbev

src/node.cc

@@ -76,7 +76,6 @@
 #include <errno.h>
 #include <fcntl.h>  // _O_RDWR
 #include <limits.h>  // PATH_MAX
-#include <locale.h>
 #include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>