ZTS: Fix zpool_status_features_001_pos local test (#17174)

Update 'zfs-helpers.sh -i' to install the compatibility.d/ file
symlinks. These are need to run the zpool_status_features_001_pos test
from a local workspace (as opposed to running ZTS from a formal
'make install' or install from RPMs, which are unaffected).

Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: @ImAwsumm
Reviewed-by: Alexander Motin <mav@FreeBSD.org>