- avoids flooding a head-node during compilation.

- also add LLVM_ARCH_PATH/bin into PATH (for finding llvm-config)

- use MPI_ARCH_PATH to provide an MPI hint when making ParaView, VTK
  and ADIOS.

  This should align the detected MPI with what OpenFOAM itself is
  using.  Option -mpi-home to override.

- does not change WM_OPTIONS or output directories, so that the target
  directories are correct.

- prevent unneeded recompilation

DOC: add link for new scotch package

- also permit petsc to determine its own hypre version (#58)

- adios is out of scope for cross-compilation

- metis does not seem to support cross-compilation.
  Use scotch instead.

- mistake introduced by 11e3723f

- check lib as well as lib64

- support -force option in a few more places

- reduces ThirdParty inter-dependency.
  Only useful for reading in graph files, which are not used
  internally by OpenFOAM.

- Was already removed for Mingw compilation.

- uses mpifcc/mpiFCC for mpicc/mpicxx, respectively

- only test in the packages that actually require it.
  State as a requirement.

ENH: skip build of packages with known mingw issues

- primarily kahip and pt-scotch.
  Others may also have issues, but for these we tend to use system
  packages anyhow.

ENH: add '-force' option to various scripts

- overrides some _lazy_ build logic

- add download hints for -help of various make scripts

- accept [0-9]* instead of attempting more restrictive specifications

CONFIG: makePETSC without fortran

- if not otherwise specified:
  - OpenFOAM-v1912 and older are implicitly `-with-lib`
  - new versions are implicitly `-no-lib`

- linkage errors for ptscotch not yet solved

CONFIG: add -I. for ThirdParty wmake Make/options

- some <headers> might otherwise be missed with the change to
  '-iquote' for general wmake rules

- improve library checks to avoid unnecessary rebuild when
  cross-compiling

- initialise some commonly used variables

- add library function for checking library existence that also
  accounts for windows cross-compilation targets

- may fail to find mpi.h with ThirdParty openmpi

- remove makeAdios1 (ADIOS1 considered defunct for our purposes)

- arguments passed to stripCompilerFlags caused the misbehaviour

- if passed things like "clang-9", strip down to the base name "clang"