www/webkit-gtk{3,4}: Flavorize: 4.0, 4.1 and 6.0 APIs

[Nuno Teixeira]

Hello all,

I'm working on webkit-gtk port and looking for sugestions on how this
update/flavorize should be.

Any help is welcome at:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275914

Thanks!

-- 
Nuno Teixeira
FreeBSD Committer (ports)