Allow the user to override the modulefile_path (root directory to
install the Open MPI modulefile), even if install_in_opt==1. For
example:
rpmbuild \
--rebuild \
--define 'install_in_opt 1' \
--define 'modulefile_path /path/to/my/modulefiles/openmpi/%{version}' \
openmpi-4.0.2-1.src.rpm
Signed-off-by: Jeff Squyres <jsquyres@cisco.com>
352e575e18