This update for mpiP, openmpi3 fixes the following issues:

- Enable openmpi3 build for all SLE versions. (bsc#1169824)
- Add missing openmpi2 build for gcc7.
- Add support for gcc8 and gcc9. (jsc#SLE-7766, jsc#SLE-8604)
- Disable openmpi1 builds for SLE/Leap > 15.1.
- Enable openmpi3 builds for Leap and SLE > 15.1. (jsc#SLE-7773)
- Fix LTO support in archive files
- created version independent doc package

This update was imported from the SUSE:SLE-15:Update update project.
This update was imported from the openSUSE:Leap:15.1:Update update project.