the ports and doc trees. There is no change if we are not building a
release (i.e., we are not using a tag of the form RELENG_ver_RELEASE
--e.g., a RELENG_ver tag used to build a snapshot).
This should allow the ports and doc freezes during the release cycles
to be somewhat shorter, as commits to those (non-branched) trees can
resume as soon as the tags are laid down.
Reviewed by: nik
Approved by: jkh
3f47f4c57c