CMake: Find HDF5 header we can safely include for other checks

[ZedThree]

I was a bit hasty in #2757: some linux distros rename H5pubconf.h so we need to potentially check a few headers. I've wrapped this up to keep things clean in the main CMake file.

[WardF]

Interesting, thanks. Out of curiosity, what is one of the Linux distros which does this? I'd be curious to run some tests.

[ZedThree]

"Enterprise Linux" (RedHat, Fedora, etc). I checked pkgs.org for others. I encountered this trying to build netCDF inside the manylinux_2_28 container for Python

[ZedThree]

Further reference, this is what the built-in FindHDF5.cmake module does too:

      foreach(_hdr "${_dir}/H5pubconf.h" "${_dir}/H5pubconf-64.h" "${_dir}/H5pubconf-32.h")

So could even drop H5public.h here?

[ZedThree]

Updated now #2838 is in

[WardF]

Thanks!