master build failing trying to install oshcc and related man pages

[hppritcha]

See IBM MTT results. Also I observed this on NERSC system using the nightly tarball.

Making install in docs
make[1]: Entering directory '/global/u2/h/hpp/mtt_X/master_scratch/MiddlewareGet_OMPIMaster/openmpi-master-202203150241-8c1495d/docs'
make  install-am
make[2]: Entering directory '/global/u2/h/hpp/mtt_X/master_scratch/MiddlewareGet_OMPIMaster/openmpi-master-202203150241-8c1495d/docs'
make[2]: *** No rule to make target 'man-openshmem/man1/oshcc.1', needed by 'all-am'.  Stop.
make[2]: Leaving directory '/global/u2/h/hpp/mtt_X/master_scratch/MiddlewareGet_OMPIMaster/openmpi-master-202203150241-8c1495d/docs'
make[1]: *** [Makefile:2315: install] Error 2
make[1]: Leaving directory '/global/u2/h/hpp/mtt_X/master_scratch/MiddlewareGet_OMPIMaster/openmpi-master-202203150241-8c1495d/docs'
make: *** [Makefile:1469: install-recursive] Error 1

[jsquyres]

Should be fixed by #10114.