* process.c (rb_clock_gettime): [DOC] FreeBSD 7.1 supports
  CLOCK_THREAD_CPUTIME_ID.
  http://www.freebsd.org/releases/7.1R/relnotes.html



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42558 b2dd03c8-39d4-4d8f-98ff-823fe69b080e