Log Message:
Update devel/ruby-thrift_client to 0.4.6

* Use lang/ruby/gem.mk instead of misc/rubygems/rubygem.mk.
* Add LICENSE.
* Remove default value of GEM_BUILD.

v0.4.6 Add support for oneway methods.

v0.4.5. Fix broken retries.

v0.4.4. Default to 0 retries rather than the number of servers.