devenum: Exclude unused header

[Andrew Talbot]

Changelog:
    devenum: Exclude unused header.

diff -urN a/dlls/devenum/mediacatenum.c b/dlls/devenum/mediacatenum.c
--- a/dlls/devenum/mediacatenum.c	2007-03-12 13:30:26.000000000 +0000
+++ b/dlls/devenum/mediacatenum.c	2007-05-01 18:23:32.000000000 +0100
@@ -23,7 +23,6 @@
  */
 
 #include "devenum_private.h"
-#include "vfwmsgs.h"
 #include "oleauto.h"
 #include "ocidl.h"