gtk+: atk is not optional

Fixes #17346.
Update require
audit: hint about depends_on Class
boost: style nits
boost149: style nits
cmake: style nits
coq: style nits
cvs2svn: style nits
drizzle: style nits
elixir: style nits
ghc: style nits
google-js-test: style nits
hyperestraier: style nits
cmu-sphinxbase: style nits
jstalk: style nits
lilypond: style nits
mlton: style nits
wxmac: style nits
uwsgi: style nits
signing-party: style nits