[at-spi2-core] registryd: Include config.h before checking HAVE_X11

[Mike Gorse <mgorse src gnome org>]

commit 1a09fbfebd6cf3361b29cf1386a402560c7c7b3b
Author: Philip Withnall <philip withnall collabora co uk>
Date:   Thu Nov 17 10:57:51 2016 +0000

    registryd: Include config.h before checking HAVE_X11
    
    https://bugzilla.gnome.org/show_bug.cgi?id=773710

 registryd/event-source.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/registryd/event-source.h b/registryd/event-source.h
index a8bbefe..7f2b5f0 100644
--- a/registryd/event-source.h
+++ b/registryd/event-source.h
@@ -23,6 +23,8 @@
 #ifndef SPI_EVENT_SOURCE_H_
 #define SPI_EVENT_SOURCE_H_
 
+#include <config.h>
+
 #ifdef HAVE_X11
 #include <X11/Xlib.h>