Update ruby22-base and ruby22 to 2.2.7.

Ruby 2.2.7 Released 2017/3/28

Ruby 2.2.7 has been released.

This release includes about 70 bug fixes after the previous release. See the
ChangeLog for details.

After this release, we will end the normal maintenance phase of Ruby 2.2, and
start the security maintenance phase of it.  This means that after the release
of 2.2.7 we will never backport any bug fixes to 2.2 except security fixes.
The term of the security maintenance phase is scheduled for 1 year.  By the
end of this term, official support of Ruby 2.2 will be over.  Therefore, we
recommend that you start planning to upgrade to Ruby 2.4 or 2.3.

(taca)