specs: luajit error output does not include error line number.
specs: luajit error output does not include error line number.

* specs/inprocess_spec.yaml (it captures raised errors): For
compatibility with luajit, don't require error line numbers.

Signed-off-by: Gary V. Vaughan <f9023000f29773649f3850298becb9544b5fd6a9@gnu.org>

gvvaughan/specl