vpnc-0.5.1: added variant for certificate support

[kiehn@…]

This patch adds a hybrid-cert variant to the vpnc Portfile. Via this variant the support for hybrid certificates can be enabled during compile-time.

[ryandesign@…]

Thanks for the update! I committed your changes in two revisions:

• r33645: add openmaintainer and obfuscate maintainer email address
• r33646: add hybrid_cert variant

Note that I changed the name of the variant to hybrid_cert; variant names are not allowed to contain a hyphen. I didn't see this mentioned in the guide, so I filed #14141 about that.

Note also that I did not increase the port revision, because there's no need to. Anyone who wants this variant will need to uninstall and reinstall the port with this variant. There's no reason to force everyone who has this port installed already to rebuild it.