* For some reason gcc 9.1 does not detect that status is never used
  uninitialized.

* Given how many lines documenting the confusing pattern and how many
  compiler warnings are eliminated by this change...

* Port this upstream and turn it into a cgribexlib update.

* AM_CONDITIONAL must be defined in all control flows, or configure cannot
  finish successfully.

* There is no caller for the newly removed function stubs anyway.

* GCC 8.x and newer warn about the previously used "void (*)()", use
  "void (*)(void)" instead.

* collSpec is meant to be a dumb data collection, none of its member should
  be subject to change.

* gcc 6.4 does not realize posix_memalign initializes ptr on some
  Linux systems.

* The previous implementation had the destructor also release the mapping.

* That was problematic, because the internals of objects depended on
  the external mapping unnecessarily.

* This also fixes a potential double-free issue discovered by Jan
  Frederik Engels.

* Not yet created resource handles are by definition unused.

* This applies to NetCDF where the first write contains invariants that
  are not present in later writes.