Tighten up some compiler coverage in CI

[NWilson]

After a recent regression in 10.45-RC1 (build fails with error-on-warn in MSVC), he's a list of some little improvements we could make:

• Use much stricter windows warnings
• Use CMake as well on FreeBSD and Solaris
• Add 64 bit Solaris build and fix existing warnings
• Consider adding an intel ICC and/or Edison EDC build for even more testing diversity?
• Add a EBCDIC build & tests
• Add a big-endian platform? (e.g. Debian Bookworm S390 via qemu)