Add a specific tag for pip pkg ci jobs on macos because of _clock_gettime...

Add a specific tag for pip pkg ci jobs on macos because of _clock_gettime missing symbol on older macOS (10.9).

It works on 10.15 (and presumably on all >= 10.12).
However 10.9 can continue to build with static libs (matio and deps) and build-run with dynamic libs.