Update ruby200 package to 2.0.0p645 (Ruby 2.0.0-p645).

>From release announce:

We are pleased to announce the release of Ruby 2.0.0-p645.

This release includes a security fix for OpenSSL extension. Please view the
topic below for more details.

    CVE-2015-1855: Ruby OpenSSL Hostname Verification

Ruby 2.0.0 is now under the state of the security maintenance phase, until
Feb. 24th, 2016. After the date, maintenance of Ruby 2.0.0 will be ended. We
recommend you start planning migration to newer versions of Ruby, such as 2.1
or 2.2.

This release includes the security fix mentioned above along with small
changes required for test environment (that shouldn’t affect normal users).

See ChangeLog for full details.

(taca)