urldata.h: fix cyassl/openssl/ssl.h build clash with wincrypt.h

Building with CyaSSL failed compilation. Reason being that OCSP_REQUEST and
OCSP_RESPONSE are enum values in CyaSSL and defines in <wincrypt.h> included
via <winldap.h> in ldap.c.

http://curl.haxx.se/mail/lib-2012-06/0196.html