OCaml 4.12.0

[Jaap Boender <jaapb%kerguelen.org@localhost>]

Hi all,

I've just committed to wip an update of OCaml to 4.12.0. As this is 
likely to break a lot of things, I'll leave it in there for a while 
before migrating to pkgsrc proper, so that people can test it and fix 
any errors. For the moment, I've not tested it much further than 'I can 
install it and use it to compile a few dependencies on amd64' - I will 
do a bit more, but any help is, of course, welcome.

best


   Jaap