New debug scheme with explicit debug channels declaration.

diff --git a/scheduler/syslevel.c b/scheduler/syslevel.c
index 5b3588e..321e40f 100644
--- a/scheduler/syslevel.c
+++ b/scheduler/syslevel.c
@@ -10,6 +10,8 @@
 #include "stackframe.h"
 #include "debug.h"
 
+DEFAULT_DEBUG_CHANNEL(win32)
+
 static CRITICAL_SECTION Win16Mutex;
 static SEGPTR segpWin16Mutex;