Various changes to make this stuff compile under Win32 and VC++ with and

without -debug option to mk1mf.pl. Change _export to is_export (_export is
a reserved word under VC++). Add yucky function prototype function pointer
casts. Sanitise the included files in crypto/x509v3.

Also changed ssleay.exe target to openssl.exe

crypto/x509v3/v3_extku.c

@@ -56,13 +56,11 @@
  *
  */
 
+
 #include <stdio.h>
-#include <stdlib.h>
-#include <pem.h>
-#include <asn1_mac.h>
-#include <err.h>
-#include <objects.h>
-#include <conf.h>
+#include "cryptlib.h"
+#include "asn1.h"
+#include "conf.h"
 #include "x509v3.h"
 
 #ifndef NOPROTO