1675479 Account for Python 3.8 deprecations (Add PY_SSIZE_T_CLEAN)

2 files Authored by pviktori 4 years ago, Committed by churchyard 4 years ago,
    Account for Python 3.8 deprecations (Add PY_SSIZE_T_CLEAN)
    
    This backports upstream commit 593faa04d96de5424c2b5163aeed4f1a562e60fd
    (The commit did not make it to matplotlib 3.1.0.)
    
        
file modified
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