oshmem: replace header files in include/mpp with symlinks

[ggouaillardet]

This is a work around to avoit what looks like a CMake bug

Thanks Paul Kapinos for the report

Fixes open-mpi/ompi#1868

(cherry picked from commit open-mpi/ompi@2a98f9f)

[lanl-ompi]

Test FAILed.

[ggouaillardet]

:bot:assign: @jsquyres
:bot:milestone:v2.0.1
:bot🏷️enhancement

[mellanox-github]

Test PASSed.
See http://bgate.mellanox.com/jenkins/job/gh-ompi-release-pr/1862/ for details.

[jsquyres]

Don't you need to remove the mpp directory as well?

[ggouaillardet]

@jsquyres that is an option
before writing the commit, i ran make uninstall and here is the content of the install dir

./share
./share/openmpi
./share/openmpi/amca-param-sets
./share/man
./share/man/man7
./share/man/man3
./share/man/man1
./etc
./lib
./lib/openmpi
./lib/pkgconfig
./bin
./include
./include/openmpi
./include/openmpi/ompi
./include/openmpi/ompi/mpiext
./include/openmpi/ompi/mpiext/affinity
./include/openmpi/ompi/mpiext/affinity/c
./include/openmpi/ompi/mpiext/cuda
./include/openmpi/ompi/mpiext/cuda/c
./include/openshmem
./include/openshmem/oshmem
./include/mpp

bottom line, directories are not removed, so for the sake of consistency, i chose not to remove the include/mp directory.
that is not a strong opinion, so if you feel this should be removed, i'll update the PR

[ggouaillardet]

:bot:nolabel:pushed-back

[jsquyres]

@ggouaillardet You're right; I guess I thought that make uninstall removed directories too, but I guess it doesn't. 👍

[jsquyres]

bot:retest

[mellanox-github]

Test PASSed.
See http://bgate.mellanox.com/jenkins/job/gh-ompi-release-pr/1893/ for details.

[mellanox-github]

Test FAILed.
See http://bgate.mellanox.com/jenkins/job/gh-ompi-release-pr/1930/ for details.