[gtk-mac-integration] Silence autopoint error.

[John Ralls <jralls src gnome org>]

commit 43856e59bcbe0788080f7dc405f24e41a94be720
Author: John Ralls <jralls ceridwen us>
Date:   Fri May 4 09:21:21 2018 -0400

    Silence autopoint error.

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index e7a40ef..b1c707c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -37,6 +37,7 @@ AM_PROG_CC_C_O
 AM_PROG_AR
 AM_PROG_LIBTOOL
 AM_GNU_GETTEXT([external])
+AM_GNU_GETTEXT_VERSION([0.19.8])
 
 AM_PATH_GLIB_2_0([2.14.0])
 AC_MSG_CHECKING([GLib Version])