[grilo] Add glib preset to meson i18n call

[Claude Paroz <claudep src gnome org>]

commit 005c29c63f310aff5e56df35659ebc9c78c3a3bc
Author: Claude Paroz <claude 2xlibre net>
Date:   Mon Mar 26 14:39:36 2018 +0200

    Add glib preset to meson i18n call
    
    Without that, no strings are extracted to the .pot file.

 po/meson.build |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/po/meson.build b/po/meson.build
index bca1fd8..785b2da 100644
--- a/po/meson.build
+++ b/po/meson.build
@@ -55,4 +55,4 @@ langs = [
 ]
 
 i18n.gettext(meson.project_name(),
-    languages: langs)
+    languages: langs, preset: 'glib')