[planner] Use native gettext instead of the glib one

[Alexandre Franke <afranke src gnome org>]

commit 33164539dbafbba6589328a97df335b478106e2a
Author: Luke Carrier <hey lukecarrier me>
Date:   Thu Feb 16 21:30:00 2012 +0100

    Use native gettext instead of the glib one
    
    https://bugzilla.gnome.org/show_bug.cgi?id=631784

 configure.in |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/configure.in b/configure.in
index c251dac..0b2eb4f 100644
--- a/configure.in
+++ b/configure.in
@@ -163,7 +163,8 @@ GETTEXT_PACKAGE=planner
 AC_SUBST(GETTEXT_PACKAGE)
 AC_DEFINE_UNQUOTED(GETTEXT_PACKAGE, "$GETTEXT_PACKAGE", [The prefix for our gettext translation domains.])
 
-AM_GLIB_GNU_GETTEXT
+AM_GNU_GETTEXT_VERSION([0.17])
+AM_GNU_GETTEXT([external])
 
 if test "x$prefix" = "xNONE"; then
   GNOMELOCALEDIR=$ac_default_prefix/${DATADIRNAME}/locale