mciwave: Exclude unused header

[Andrew Talbot]

Changelog:
    mciwave: Exclude unused header.

diff -urN a/dlls/mciwave/mciwave.c b/dlls/mciwave/mciwave.c
--- a/dlls/mciwave/mciwave.c	2006-10-12 21:30:57.000000000 +0100
+++ b/dlls/mciwave/mciwave.c	2007-05-08 22:58:52.000000000 +0100
@@ -22,7 +22,6 @@
 
 #include <stdarg.h>
 
-#include "winerror.h"
 #include "windef.h"
 #include "winbase.h"
 #include "wingdi.h"