use SIGCHLD_LOSSY to enable waitpid polling mode
Some systems lack SIGCHLD or have incomplete SIGCHLD implementations. So enable polling mode for them.
[ruby-core:87705] [Bug #14867]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63795 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
use SIGCHLD_LOSSY to enable waitpid polling mode
Some systems lack SIGCHLD or have incomplete SIGCHLD
implementations. So enable polling mode for them.
[ruby-core:87705] [Bug #14867]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63795 b2dd03c8-39d4-4d8f-98ff-823fe69b080e