New debug scheme with explicit debug channels declaration.

diff --git a/graphics/metafiledrv/init.c b/graphics/metafiledrv/init.c
index de9c932..1d89419 100644
--- a/graphics/metafiledrv/init.c
+++ b/graphics/metafiledrv/init.c
@@ -13,6 +13,8 @@
 #include "metafiledrv.h"
 #include "debug.h"
 
+DEFAULT_DEBUG_CHANNEL(metafile)
+
 #include <string.h>
 
 static const DC_FUNCTIONS MFDRV_Funcs =