[cluttermm] ActorBox: Make the constructor explicit.

[Murray Cumming <murrayc src gnome org>]

commit 68361564e3020be5c4fe1602ecd59973bfb9ecf0
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Mar 21 10:34:22 2014 +0100

    ActorBox: Make the constructor explicit.

 clutter/src/actor.hg |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/clutter/src/actor.hg b/clutter/src/actor.hg
index 1f7c739..aaff73d 100644
--- a/clutter/src/actor.hg
+++ b/clutter/src/actor.hg
@@ -44,7 +44,7 @@ public:
   _CUSTOM_DEFAULT_CTOR
 
   //hand-coded constructor to allow default values:
-  ActorBox(float x1 = 0, float y1 = 0, float x2 = 0, float y2 = 0);
+  explicit ActorBox(float x1 = 0, float y1 = 0, float x2 = 0, float y2 = 0);
 
   // Convenience constructor that would be difficult to wrap - it's got 4
   // floats (origin x and y and the width and height) so will conflict with the