(Only the first 10 of 1277 ports in this commit are shown above. )
Change cmake default behaviour to outsource.
Ports that build out of source now simply can use "USES=cmake"
instead of "USES=cmake:outsource". Ports that fail to build
out of source now need to specify "USES=cmake:insource".
I tried to only set insource where explictely needed.
Exp-run by: antoine