Fixed header dependencies to be fully compatible with the Windows
headers (with help from Dimitrie O. Paun).

dlls/imagehlp/access.c

diff --git a/dlls/imagehlp/access.c b/dlls/imagehlp/access.c
index d8cba65..558788b 100644
--- a/dlls/imagehlp/access.c
+++ b/dlls/imagehlp/access.c
@@ -18,11 +18,12 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
+#include <stdarg.h>
 #include <string.h>
+#include "windef.h"
 #include "winbase.h"
 #include "winnt.h"
 #include "winerror.h"
-#include "windef.h"
 #include "wine/debug.h"
 #include "imagehlp.h"