[polari] build: fix build against latest gnome-common

[Cosimo Cecchi <cosimoc src gnome org>]

commit 8fea2e8838c82a776e3f506797c956ff1aeb516d
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Mon Sep 2 13:14:57 2013 -0700

    build: fix build against latest gnome-common
    
    The use of IT_PROG_INTLTOOL and AM_GNU_GETTEXT together is not
    supported.

 configure.ac |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 0aa1014..c463072 100644
--- a/configure.ac
+++ b/configure.ac
@@ -9,9 +9,6 @@ GETTEXT_PACKAGE=AC_PACKAGE_NAME
 AC_SUBST(GETTEXT_PACKAGE)
 IT_PROG_INTLTOOL(0.40.0)
 
-AM_GNU_GETTEXT([external])
-AM_GNU_GETTEXT_VERSION([0.17])
-
 GOBJECT_INTROSPECTION_REQUIRE([0.9.6])
 
 AM_DISABLE_STATIC