* thread.c (rb_thread_select): rewrite by using
  rb_thread_fd_select(). old one is EINTR unsafe.
  Patch by Eric Wong. [Bug #5229] [ruby-core:39102]

* test/-ext-/old_thread_select/test_old_thread_select.rb:
  a testcase for rb_thread_select().
* ext/-test-/old_thread_select/old_thread_select.c: ditto.
* ext/-test-/old_thread_select/depend: ditto.
* ext/-test-/old_thread_select/extconf.rb: ditto.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@33119 b2dd03c8-39d4-4d8f-98ff-823fe69b080e