[glib] configure: close a parenthese in an error message.

[Jehan Pagès <jehanp src gnome org>]

commit 9bc3d025f97ad1db456604f42bd014b7a9ac4048
Author: Jehan <jehan girinstud io>
Date:   Sat Jul 1 17:03:29 2017 +0200

    configure: close a parenthese in an error message.

 configure.ac |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 00042e5..7c0fa68 100644
--- a/configure.ac
+++ b/configure.ac
@@ -465,8 +465,8 @@ GLIB_GNU_GETTEXT
 
 if test "$gt_cv_have_gettext" != "yes" ; then
   AC_MSG_ERROR([
-*** You must have either have gettext support in your C library, or use the 
-*** GNU gettext library. (http://www.gnu.org/software/gettext/gettext.html
+*** You must have either have gettext support in your C library, or use the
+*** GNU gettext library. (http://www.gnu.org/software/gettext/gettext.html)
 ])
 fi