lalinference: don't package MPI code

The way packages that use MPI has been updated in RHEL8 and as such the
MPI code here no longer works, disable building against MPI until this
can be addressed. If MPI is needed then the Conda packages support MPI.

lalinference/lalinference.spec.in

 %define nightly @NIGHTLY_VERSION@%{nil}
 %define _sysconfdir %{_prefix}/etc
 %define release 1
-%define configure_opts --enable-openmp --enable-mpi MPICC=/usr/lib64/openmpi/bin/mpicc
+%define configure_opts %{nil}
 
 %if "%{?nightly:%{nightly}}%{!?nightly:0}" == "%{nil}"
 %undefine nightly
@@ -32,7 +32,6 @@ BuildRequires: liblalsimulation-devel >= @MIN_LALSIMULATION_VERSION@
 BuildRequires: liblalburst-devel >= @MIN_LALBURST_VERSION@
 BuildRequires: liblalinspiral-devel >= @MIN_LALINSPIRAL_VERSION@
 BuildRequires: make
-BuildRequires: openmpi-devel
 BuildRequires: pkgconfig >= 0.18.0
 
 # swig