* This is meant to reduce memory foot-print by merging variable buffers.
* Free all allocated resources after use.

* And on AIX it isn't.

This reverts commit fe250209a1d87d4a6e5378acf0bb98db2bfdb63c.

* The previous commit neglected special cases for the CDI-pio variant.

* pthread_once_t provides the same semantics.

* It depends on having a Fortran compiler in the first place.