textproc/rubygem-scss_lint, textproc/rubygem-compass,
textproc/rubygem-compass-import-once, textproc/rubygem-compass-core: Depend
on textproc/rubygem-sass34, so that textproc/rubygem-sass can be upgraded.
The gemspecs for these gems require a version of sass < 3.5.

Approved by: sunpoet (maintainer)
Differential Revision: https://reviews.freebsd.org/D11809