Ruby

test_process.rb: remove intermediate child process

• test/ruby/test_process.rb (test_deadlock_by_signal_at_forking):
  spawn the target process directly with assert_separately and
  remove intermediate child process.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49807 b2dd03c8-39d4-4d8f-98ff-823fe69b080e