Expose C library's gettext. Fixes #516412.
diff --git a/pyconfig.h.in b/pyconfig.h.in
index ca71726..d97c054 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -645,6 +645,9 @@
 /* Define if you have the <langinfo.h> header file.  */
 #undef HAVE_LANGINFO_H
 
+/* Define if you have the <libintl.h> header file.  */
+#undef HAVE_LIBINTL_H
+
 /* Define if you have the <libutil.h> header file.  */
 #undef HAVE_LIBUTIL_H