rb_wait_for_single_fd() internal function.
The patch was written by Eric Wong. [ruby-core:35991]
* test/-ext-/wait_for_single_fd/test_wait_for_single_fd.rb: ditto.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31428 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
kosaki