winenas.drv: Exclude unused headers

[Andrew Talbot]

Changelog:
    winenas.drv: Exclude unused headers.

diff -urN a/dlls/winenas.drv/audio.c b/dlls/winenas.drv/audio.c
--- a/dlls/winenas.drv/audio.c	2007-03-12 13:30:55.000000000 +0000
+++ b/dlls/winenas.drv/audio.c	2007-05-22 19:26:26.000000000 +0100
@@ -74,10 +74,8 @@
 #include "winbase.h"
 #include "wingdi.h"
 #include "winuser.h"
-#include "winerror.h"
 #include "mmddk.h"
 #include "dsound.h"
-#include "dsdriver.h"
 #include "nas.h"
 #include "wine/unicode.h"
 #include "wine/debug.h"