[gnome-builder] gettext: fix -Wsign-compare warning

[Christian Hergert <chergert src gnome org>]

commit a208a9075f2fc931c5a8595c51a45bc23be309e4
Author: Christian Hergert <chergert redhat com>
Date:   Tue Feb 28 11:42:21 2017 -0800

    gettext: fix -Wsign-compare warning

 plugins/gettext/ide-gettext-diagnostic-provider.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/plugins/gettext/ide-gettext-diagnostic-provider.c 
b/plugins/gettext/ide-gettext-diagnostic-provider.c
index b745a77..b7604ec 100644
--- a/plugins/gettext/ide-gettext-diagnostic-provider.c
+++ b/plugins/gettext/ide-gettext-diagnostic-provider.c
@@ -28,7 +28,7 @@ struct _IdeGettextDiagnostics
 {
   GObject         parent_instance;
   IdeDiagnostics *diagnostics;
-  guint64         sequence;
+  gint64          sequence;
 };
 
 struct _IdeGettextDiagnosticProvider