[Blink] python-enum34

[Daniel Gnoutcheff]

The `blink` Debian packages have a Depends: dependency on python-enum34. 
  That package has been removed from Debian testing and unstable, and it 
is not included in the recent (Aug 14 2021) "bullseye" stable release.

With the port to Python3, this package is no longer used by Blink.  It 
builds, installs, and runs fine once I drop it from debian/control.

Thanks,
-- 
Daniel Gnoutcheff
Systems Administrator
Software Freedom Law Center