Updated fork of metastore allows building on macOS

I recently found another fork of metastore that allows its build on macOS
systems (https://github.com/mpctx/metastore). So I forked it into my own
fork with several other corrections (mostly cosmetic!), so it is now much
better suited for this pipeline.

Raul Infante-Sainz has already tested the building of metastore on his
macOS. In a previous test, we also noticed that libbsd should not be built
on Mac systems, so it is now a conditional prerequisite to metastore.

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