New debug scheme with explicit debug channels declaration.

diff --git a/windows/x11drv/clipboard.c b/windows/x11drv/clipboard.c
index 92da752..cb07e66 100644
--- a/windows/x11drv/clipboard.c
+++ b/windows/x11drv/clipboard.c
@@ -20,6 +20,8 @@
 #include "windef.h"
 #include "x11drv.h"
 
+DEFAULT_DEBUG_CHANNEL(clipboard)
+
 extern HWND hWndClipOwner;
 extern HWND hWndClipWindow;
 extern WINE_CLIPFORMAT ClipFormats[];