netcdf-cxx4 Package: updates to build on Mac OS (#29246)

Bug fixes for package netcdf-cxx4 so that it builds on macOS semi
case-sensitive filesystems; this includes additional changes to build
netcdf-cxx4 consistently with netcdf-fortran.

* netcdf-fortran: remove unused config_flags
* netcdf-fortran: avoid building without the optimization flags
* netcdf-cxx4: do not enforce autoreconf. This was a rudiment from the
  times when the package was fetched with git, which broke timestamp
  order of the automatically generated Autoconf files.
* netcdf-cxx4: inject PIC flags for C++ when '+pic'
* netcdf-cxx4: inject C/CXXFLAGS via the wrapper
* netcdf-cxx4: fix the underlinking problem for platforms other than darwin
  (add netcdf-c libs netcdf-cxx4 ldlibs flags)
* netcdf-cxx4: remove redundant extension of CPPFLAGS
* netcdf-cxx4: only need to use MPI compiler wrapper when building C
  (vs both C and C++)
* netcdf-cxx4: remove variant 'static'
  This makes it consistent with other packages from the NetCDF
  constellation: always build the static libraries and additionally
  build the shared ones when '+shared'.
* netcdf-cxx4: do not configure --with/--without-pic.
  This makes it consistent with other packages from the NetCDF
  constellation: build the shared libraries with the PIC flag and
  the static ones without it (the default for Autotools) when
  '~pic', and build the static libraries with PIC when '+pic' (to
  make them injectable into other shared libraries).
* netcdf-cxx4: run the tests serially
* netcdf-cxx4: build the plugins only when the tests are run

Co-authored-by: Sergey Kosukhin <sergey.kosukhin@mpimet.mpg.de>

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