* process.c (rb_clock_gettime): New method.
  This is accepted in the meeting:
  https://bugs.ruby-lang.org/projects/ruby/wiki/DevelopersMeeting20130809
  This method is accepted as a CRuby feature.
  I.e. Other Ruby implementations don't need to implement it.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42504 b2dd03c8-39d4-4d8f-98ff-823fe69b080e