re-evaluate the fix for GHC #3231 in Process

[Mistuke]

It is not entirely clear whether the workaround for #3231 is effective or the right solution as the problem never seems to have done away and the carved out exception in process seems odd.

The core issue is waiting for resources to be released which we have now done in process when process_jobs are used.

The implemented workaround doesn't seem to have solved the issue as the bug was re-opened and doesn't work with re-directed handles.

See https://gitlab.haskell.org/ghc/ghc/issues/3231 and #177