[cluttermm] clutter_signals.defs: Manually add a const to fix the build.

[Murray Cumming <murrayc src gnome org>]

commit fd76074ddb64197172fbcb1c50d6824f83ff6b97
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Mar 4 23:24:49 2014 +0100

    clutter_signals.defs: Manually add a const to fix the build.
    
    The C header now uses a const for the signal's default signal
    handler's parameter, but the GType signal cannot represent that.

 clutter/src/clutter_signals.defs |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/clutter/src/clutter_signals.defs b/clutter/src/clutter_signals.defs
index 9be4c66..135bdcf 100644
--- a/clutter/src/clutter_signals.defs
+++ b/clutter/src/clutter_signals.defs
@@ -2283,12 +2283,13 @@
   )
 )
 
+; We add the const- manually:
 (define-signal cursor-event
   (of-object "ClutterText")
   (return-type "void")
   (when "last")
   (parameters
-    '("ClutterGeometry*" "p0")
+    '("const-ClutterGeometry*" "p0")
   )
 )