* thread_pthread.c: rlimit is only available on Linux.
  At least r44712 breaks FreeBSD.
  [ruby-core:60113] [Bug #9454]

git-svn-id: svn+ssh://svn.ruby-lang.org/ruby/trunk@44725 b2dd03c8-39d4-4d8f-98ff-823fe69b080e