[caribou] libcaribou: fix dereferencing Gdk.XEvent pointer with Vala 0.16

[Daiki Ueno <dueno src gnome org>]

commit 76ae60f9518ae8b0042157bdc0c3f7304abe3a0e
Author: Daiki Ueno <ueno unixuser org>
Date:   Fri Jan 18 12:45:44 2013 +0900

    libcaribou: fix dereferencing Gdk.XEvent pointer with Vala 0.16
    
    https://bugzilla.gnome.org/show_bug.cgi?id=691992

 libcaribou/xadapter.vala |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)
---
diff --git a/libcaribou/xadapter.vala b/libcaribou/xadapter.vala
index c7c314d..49aeb68 100644
--- a/libcaribou/xadapter.vala
+++ b/libcaribou/xadapter.vala
@@ -86,7 +86,18 @@ namespace Caribou {
         }
 
         private Gdk.FilterReturn x_event_filter (Gdk.XEvent xevent, Gdk.Event event) {
+            // After the following commit, Vala changed the definition
+            // of Gdk.XEvent from struct to class:
+            // http://git.gnome.org/browse/vala/commit/?id=9c52e7b7
+            //
+            // This affects the meaning of address-of (&) operator:
+            // '&xevent' now refers to the address of XEvent*, not
+            // XEvent.
+#if VALA_0_16
+            void* pointer = xevent;
+#else
             void* pointer = &xevent;
+#endif
             Xkb.Event* xkbev = (Xkb.Event *) pointer;
             X.Event* xev = (X.Event *) pointer;