avicap32: Exclude unused header

[Andrew Talbot]

Changelog:
    avicap32: Exclude unused header.

diff -urN a/dlls/avicap32/avicap32_main.c b/dlls/avicap32/avicap32_main.c
--- a/dlls/avicap32/avicap32_main.c	2006-10-24 19:41:27.000000000 +0100
+++ b/dlls/avicap32/avicap32_main.c	2007-04-21 21:21:54.000000000 +0100
@@ -50,7 +50,6 @@
 #include "wingdi.h"
 #include "winuser.h"
 #include "vfw.h"
-#include "winreg.h"
 #include "winnls.h"
 #include "winternl.h"
 #include "wine/debug.h"