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* pgcc 20 cannot handle this steaming hot C99 material.

* These functions are only needed when cfortran glue code passes
  strings from Fortran to C or the other way round.

* gfortran 10 otherwise warns about inconsistent use of
  dummy arguments a/send_buf/recv_buf respectively.

* This is the default on gcc 10, but doesn't hurt to specify for older
  versions too in case the user activates -fno-common.

* This improves resiliency to changes in project directory changes too.

* Pass --with-on-demand-check-programs to configure to only build
  test programs when make check is invoked.

* This copies a patch for YAXT by Sergey Kosukhin.

* If an MPI launcher is available, we want to run the tests, even if
  the result is ignored in setups with --without-regard-for-quality,
  because the orthogonal MPI_LAUNCH=true setting is sufficient to
  suppress MPI run-time tests if desired.

Sergey Kosukhin authored Sep 18, 2019 and Thomas Jahns committed Aug 04, 2020

* The files for these modules are frequently not found, because they
  are provided by the compiler in some place not directly observable.