Checkout git submodule if it was not done before

[Bjoe]

It's nice to have. I'm every time clone the projects without --recursive, because some project checkout like the "whole world" ;-) ... so I'm carfully with --recusive. But it gets some weird cmake errors when neopg is not checkout with --recursive. It`s nice to have a submodule checkout from cmake if anyone forgot it :-)

[lambdafu]

To be honest, I hate submodules anyway. Maybe we should copy. I'll revisit what we need them for right now.

[Bjoe]

To be honest, I hate submodules anyway.

Yep, me too! :-) .... I have also for that a suggestion ... but it is still in testing/develop. Hopefully in the end of November I can give you a quick working version and you can decide if you want it or not....