Update devel/cmake to 3.15.2 (latest upstream release)
Release notes for the version updates are at:
For FreeBSD, not much interesting has changed. Swift language support
might be useful.
A few ports were fixed as part of this exp-run (libemos not really
related to the CMake update, but in general). Thanks to antoine
for the exp-runs, tcberner for doing most of the prep-work.
Submitted by: tcberner