- Add support for gcc8 and gcc9 (jsc#SLE-7766 & jsc#SLE-8609).

- Update to version 4.7.1:
* Remove obsolete _CRAYMPP and LOCKNUMREC macros from
code. Also brought documentation up to date in man page.
* Remove obsolete and deprecated functions nc_set_base_pe()
and nc_inq_base_pe() from the dispatch table. (Both functions
are still supported in the library, this is an internal
change only.)
* Fix: Reverted nccopy behavior so that if no -c parameters are
given, then any default chunking is left to the netcdf-c library
to decide.
- Disable openmpi1 builds for SLE/Leap > 15.1.
- Enable openmpi3 builds for Leap and SLE > 15.1 (jsc#SLE-7773).