1939196 Update to 20.6.0 (bz#1840109)

Authored and Committed by orion 3 years ago
    Update to 20.6.0 (bz#1840109)
    Resolve Python 3.9 issue (bz#1838696)
    Only remove Cython generated .c files
    Add BR on libuv-devel
    Use updated build variables
    Run tests, but do not fail on them for now
    
        
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