d3dx9_25: Remove unused Wine debug channel

[Andrew Talbot]

Changelog:
    d3dx9_25: Remove unused Wine debug channel.

diff --git a/dlls/d3dx9_25/d3dx9_25_main.c b/dlls/d3dx9_25/d3dx9_25_main.c
index 2820664..57a0669 100644
--- a/dlls/d3dx9_25/d3dx9_25_main.c
+++ b/dlls/d3dx9_25/d3dx9_25_main.c
@@ -28,12 +28,9 @@
 #include "winbase.h"
 #include "wingdi.h"
 #include "winuser.h"
-#include "wine/debug.h"
 
 #include "d3dx9.h"
 
-WINE_DEFAULT_DEBUG_CHANNEL(d3dx);
-
 /***********************************************************************
  * DllMain.
  */