git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@27967 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
lib/irb/cmd/fork.rb, lib/mutex_m.rb,
lib/shell/process-controller.rb, lib/sync.rb, object.c:
suppress warnings patched by Benoit Daloze at [ruby-core:30366].
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@27967 b2dd03c8-39d4-4d8f-98ff-823fe69b080e