Fix searching of shared libraries on OpenBSD (#3851)

* get_library_naming: Use templates instead of suffix/prefix pairs

This commit does not change functionality, and merely sets the
groundwork for a more flexibly naming implementation.

* find_library: Fix manual searching on OpenBSD

On OpenBSD, shared libraries are called libfoo.so.X.Y where X is the
major version and Y is the minor version. We were assuming that it's
libfoo.so and not finding shared libraries at all while doing manual
searching, which meant we'd link statically instead.

See: https://www.openbsd.org/faq/ports/specialtopics.html#SharedLibs

Now we use file globbing to do searching, and pick the first one
that's a real file.

Closes https://github.com/mesonbuild/meson/issues/3844

* find_library: Fix priority of library search in OpenBSD

Also add unit tests for the library naming function so that it's
absolutely clear what the priority list of naming is.

Testing is done with mocking on Linux to ensure that local testing
is easy

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