69bc510 frontend: don't duplicate enums.BuildSourceEnum

1 file Authored by praiskup 3 years ago, Committed by praiskup 3 years ago,
    frontend: don't duplicate enums.BuildSourceEnum
    
    We include helpers.BuildSourceEnum on many places in Frontend code.  So
    to not touch all the places now, let's just import BuildSourceEnum
    inside helpers so we can techincally import from both places.
    
    Fixing also some import PyLint issues that popped-up in this change.