Support compilation of OpenFOAM without libz

The libz is used in OpenFOAM to support input/output file compression. It should be possible and perhaps even desirable to use without libz as well, as @Prashant has mentioned.

assigned to @mark

As well as enable/disable, it could be reasonable to support non-system locations This is probably a minor configuration gap for the spack and easybuild installations. They are most likely using the system libz and not the one from their software stack.

mentioned in commit 6e2b7be9

@mark - still open/valid?

Use of libz can be manually disabled by edit of OpenFOAM/Make/options - nothing automated since this is still somewhat rare.

closed