[Debian-astro-maintainers] Bug#858948: python-ginga: Drop obsolete recommends on pywebkitgtk

[Jeremy Bicha]

Package: python-ginga
Version: 2.6.1-1
Severity: serious
Justification: blocks removal of no longer supported packages

python-ginga has an alternate recommends on pywebkitgtk, but
pywebkitgtk has been removed from Debian stretch. (See
https://bugs.debian.org/790218 ).

I believe this is a Release Critical bug because as long as something
installed still recommends the package, it will stay installed on
users' computers even though the package is no longer built in Debian
or supported.

Thanks,
Jeremy Bicha