sxs: Remove unused Wine debug channel

[Andrew Talbot]

Changelog:
    sxs: Remove unused Wine debug channel.

diff --git a/dlls/sxs/sxs.c b/dlls/sxs/sxs.c
index cd64de5..06e6672 100644
--- a/dlls/sxs/sxs.c
+++ b/dlls/sxs/sxs.c
@@ -22,9 +22,6 @@
 
 #include "windef.h"
 #include "winbase.h"
-#include "wine/debug.h"
-
-WINE_DEFAULT_DEBUG_CHANNEL(sxs);
 
 
 /***********************************************************************