enkessler / childprocess / 344

90%

master: 90%

Pull #132

travis-ci

Only require FFI on Windows

This allows users to trade off between full-featured and
always-deployable by removing the hard dependency on a native extension.
The user of the gem needs to depend on FFI themselves to enable
`posix_spawn` on Linux.

For testing purposes, the Gemfile loads ffi if required by the environment.

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