RT3031: Need to #undef some names for win32

Copy the ifdef/undef stanza from x509.h to x509v3.h
Reviewed-by: NDr. Stephen Henson <steve@openssl.org>

crypto/x509v3/x509v3.h

@@ -66,6 +66,13 @@
 extern "C" {
 #endif
 
+#ifdef OPENSSL_SYS_WIN32
+/* Under Win32 these are defined in wincrypt.h */
+#undef X509_NAME
+#undef X509_CERT_PAIR
+#undef X509_EXTENSIONS
+#endif
+
 /* Forward reference */
 struct v3_ext_method;
 struct v3_ext_ctx;