[libgxps] debug: include gxps-version.h for GXPS_VAR

[Ernestas Kulik <ernestask src gnome org>]

commit 72e8737ac64c2f5dda6c0d8acc3bede1334d7e0d
Author: Ernestas Kulik <ernestask src gnome org>
Date:   Sat Oct 1 19:26:35 2016 +0300

    debug: include gxps-version.h for GXPS_VAR
    
    GXPS_VAR is defined in gxps-version.h, which is not being included,
    resulting in build failure.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=772296

 libgxps/gxps-debug.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/libgxps/gxps-debug.h b/libgxps/gxps-debug.h
index 78eaac5..eb53d75 100644
--- a/libgxps/gxps-debug.h
+++ b/libgxps/gxps-debug.h
@@ -21,6 +21,8 @@
 
 #include <glib.h>
 
+#include "gxps-version.h"
+
 G_BEGIN_DECLS
 
 #ifdef GXPS_ENABLE_DEBUG