enkessler / childprocess / 446

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Fix ChildProcess::Unix::Process#wait method with leader processes

Issue #151 reported a problem where in the update from Ruby 2.5 to Ruby
2.6 some programs would block forever on a `Process.waitpid2` call.

Changing the call to pass in a positive PID instead of the negative PID
fixes the issue as it will call the `waitpid` system call right away
instead of delaying it for later.

See #151 for further discussion of the possible reasons for the
behavior.

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