86ee908 Drop --single-version-externally-managed, it breaks the build

Authored and Committed by churchyard 4 years ago
    Drop --single-version-externally-managed, it breaks the build
    
    See also https://src.fedoraproject.org/rpms/python-rpm-macros/pull-request/34
    
    The change in python-rpm-macros broke passing arguments like this,
    however it was not needed here.
    
        
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