New debug scheme with explicit debug channels declaration.

diff --git a/windows/mouse.c b/windows/mouse.c
index 115fd0c..04b7d28 100644
--- a/windows/mouse.c
+++ b/windows/mouse.c
@@ -11,6 +11,8 @@
 #include "winuser.h"
 #include "win.h"
 
+DEFAULT_DEBUG_CHANNEL(event)
+
 /**********************************************************************/
 
 MOUSE_DRIVER *MOUSE_Driver = NULL;