[clutter] clutter/clutter-rotate-action.c: Use G_PI instead of M_PI

[Chun-wei Fan <fanchunwei src gnome org>]

commit 465ab95a64f780eb963a137cb811b435c2af9c4e
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Fri Dec 14 19:50:27 2012 +0800

    clutter/clutter-rotate-action.c: Use G_PI instead of M_PI
    
    ...because M_PI is not universally available

 clutter/clutter-rotate-action.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/clutter/clutter-rotate-action.c b/clutter/clutter-rotate-action.c
index a5fdefb..e355d3a 100644
--- a/clutter/clutter-rotate-action.c
+++ b/clutter/clutter-rotate-action.c
@@ -151,7 +151,7 @@ clutter_rotate_action_gesture_progress (ClutterGestureAction *action,
         angle = -angle;
 
       /* Convert radians to degrees */
-      angle = angle * 180.0 / M_PI;
+      angle = angle * 180.0 / G_PI;
 
       g_signal_emit (action, rotate_signals[ROTATE], 0,
                      actor, angle,