bpo-40854: Allow overriding sys.platlibdir via PYTHONPLATLIBDIR env-var (GH-20605) (GH-20725)

(cherry picked from commit 8f023a2f664f902a3d0b7a6f64d63afc0d1c15ae)

Co-authored-by: Sandro Mani <manisandro@gmail.com>
11 files changed