OSHMEM installs man pages even if --disable-oshmem is used

[jsquyres]

@miked-mellanox @jladd-mlnx Can someone at Mellanox have a look?

Thanks.

[mike-dubman]

@igor-ivanov - could you please take a look. thanks

[hppritcha]

@igor-ivanov can this issue be closed?

[igor-ivanov]

@hppritcha yes