fix: create a new pty for exec.Cmd

[caarlos0]

dirty fix to "inappropriate ioctl for device" on macOS.

It seems that macOS kills the slave pty once exec.Cmd finishes... so we need to create a new PTY just to run said program in order to avoid that problem.

Need to test, but this might make things possible on windows, too.

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##             pty-command     #230   +/-   ##
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  Misses                 ?      160           
  Partials               ?       54           

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[caarlos0]

It "kinda" works on windows, but when the pty dies, so dies the parent process (the wish server).

Not sure if it is fixable...