Remove --enable-openmp flags and reqs for lalapps
This MR removes usage and requirements for openmp, including the
--enable-openmp configure argument for LALApps, since that isn't actually used in this package. I think this is a legacy of lalinference executables living in lalapps.
API Changes and Justification
Backwards Compatible Changes
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Backwards Incompatible Changes
- This change modifies an existing API
- This change removes an existing API
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