[gnome-shell] gnome-shell-calendar-server: add missing gtk.h include

[Rico Tzschichholz <ricotz src gnome org>]

commit 7680819108c640e6913185cafe0b03d5c58730d6
Author: Rico Tzschichholz <ricotz t-online de>
Date:   Tue Apr 17 08:15:06 2012 +0200

    gnome-shell-calendar-server: add missing gtk.h include
    
    6099a5dbc3e332e789f67eb3aaf0391dea2e7a75 introduced this dependency
    but didn't add it which lead to build failure with
    -Werror=implicit-function-declaration

 src/calendar-server/gnome-shell-calendar-server.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/calendar-server/gnome-shell-calendar-server.c b/src/calendar-server/gnome-shell-calendar-server.c
index 8db8d1c..fedb89f 100644
--- a/src/calendar-server/gnome-shell-calendar-server.c
+++ b/src/calendar-server/gnome-shell-calendar-server.c
@@ -34,6 +34,7 @@
 #include <unistd.h>
 
 #include <gio/gio.h>
+#include <gtk/gtk.h>
 
 #define HANDLE_LIBICAL_MEMORY
 #include <libecal/e-cal-client.h>