Use float value of ST_MTIME in copy_file function #379
      
        
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The
copy_filefunction usesst[ST_MTIME]when copying timestamps which is an intwhereas the
newerfunction usesos.path.getmtimewhich returns a float to check ifa file is outdated. This causes the copied file to always be older than the source file.
This commit updates the
copy_filefunction to usest.st_mtimewhich is the float value.Ref: pypa/setuptools#5079