ash: prevent leakage of process handlesHEADmaster

When the shell invoked process substitution it retained a process
handle to the child.  These handles could accumulate without limit.

The shell in upstream BusyBox doesn't bother to create a job
structure for process substitutions or here documents.  This isn't
appropriate on Windows, where we need to track the child process
handles.  Create job structures as required.

Saves 32-48 bytes.

(GitHub issue #587)

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