New debug scheme with explicit debug channels declaration.

diff --git a/windows/dinput.c b/windows/dinput.c
index 800e489..09ddadf 100644
--- a/windows/dinput.c
+++ b/windows/dinput.c
@@ -34,6 +34,8 @@
 #include "mouse.h"
 #include "sysmetrics.h"
 
+DEFAULT_DEBUG_CHANNEL(dinput)
+
 extern BYTE InputKeyStateTable[256];
 extern int min_keycode, max_keycode;
 extern WORD keyc2vkey[256];