* process.c (get_clk_tck): Extracted from rb_proc_times.
  (rb_clock_gettime): times() based CLOCK_PROCESS_CPUTIME_ID emulation
  is implemented.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42642 b2dd03c8-39d4-4d8f-98ff-823fe69b080e