Update net/libvncserver to 0.9.12

[dereks_lifeofadishwasher.com]

Summary

• Update to 0.9.12 [1]
• cmake is the new build system
• portlint clean up
• patch-common_md5* is now in upstream
• lzo2 is now included via a shared lib
• libva removed in 0.9.11

[1] - https://github.com/LibVNC/libvncserver/releases/tag/LibVNCServer-0.9.12

Looking for 0.9.12 update to support this fix https://github.com/LibVNC/libvncserver/pull/238
That fixes this issue in emulators/virtualbox-ose https://www.virtualbox.org/ticket/17396

First attempt at cmake port (at least converting from make to cmake).

A couple questions:
New to 0.9.12 should the shared lzo2 be an option or default?
pkgconfig -config was removed or not included in cmake now?
static libs haven't been added to cmake files (yet?) either

Test Plan

testport, bulk, rebuild alt. port depending on libvncserver (x11vnc)

[dereks_lifeofadishwasher.com]

Rebuilt net/x11vnc and emulators/virtualbox-ose.
Also confirmed 0.9.12 fixes emulators/virtualbox-ose virtualbox.org ticket.

[araujo]

I will commit it in a few!
Thanks again and sorry my delay!

[dereks_lifeofadishwasher.com]

Looks like there were a couple scenarios that might cause the port to fail due to the new cmake build system and the defaults it sets.