cmake: add soversion to libH5mdCore

[junghans]

Just #2946 again, not why it didn't make it in v4.1

[codecov]

Codecov Report

Merging #3226 into 4.1 will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##             4.1   #3226   +/-   ##
=====================================
  Coverage     85%     85%           
=====================================
  Files        530     530           
  Lines      26025   26025           
=====================================
  Hits       22157   22157           
  Misses      3868    3868

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[mkuron]

Thanks. Seems like we forgot to cherry-pick it into the master branch. We'll definitely need to do that now.

[KaiSzuttor]

@junghans could you please explain why this is needed?

[mkuron]

Generating a Fedora RPM throws a warning if a library isn't versioned, if I remember correctly. An unversioned library is named libSomething.so, while a versioned library is named libSomething.so.4 with a symlink libSomething.so pointing to it.

pdbreader.so, mpiio.so and pdbparser.so are also missing versions.

[junghans]

In general shared libraries should be versioned, but now as everything gets installed in the pythondir we could drop the soversion completely.

And there is another bug as pdbreader and mpiio don't get installed at all.

[junghans]

See #3228 for replacement.