[gtk+] meson: Make sure ENABLE_NLS is actually defined

[Matthias Clasen <matthiasc src gnome org>]

commit dec77c3a7ada377252923e360d0061b91c821f48
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Aug 27 16:01:24 2017 -0400

    meson: Make sure ENABLE_NLS is actually defined
    
    Despite the comment, we ended up without ENABLE_NLS.

 config.h.meson |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/config.h.meson b/config.h.meson
index b1f286b..09ab069 100644
--- a/config.h.meson
+++ b/config.h.meson
@@ -1,7 +1,7 @@
 /* config.h.in.  Generated from configure.ac by autoheader.  */
 
 /* always defined to indicate that i18n is enabled */
-#mesondefine ENABLE_NLS
+#define ENABLE_NLS 1
 
 /* The prefix for our gettext translation domains. */
 #mesondefine GETTEXT_PACKAGE