[libcxx-dev] libcxx test uses removed Python module

[Brandon Egbert via libcxx-dev]

There are two calls of 'platform.linux_distribution' in
'libcxx/test/target_info.py'.  'platform.linux_distribution' was deprecated
in Python 3.5 and completely removed in Python 3.8 which causes the test to
fail on systems running Python 3.8.

'distro.linux_distribution' seems to be the replacement.
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