build-unit-test: Remove objmgr workaround

There used to be a systemd dependency on the phosphor-objmgr
repo that required it to be built a special config flag.

Things build without it now, so remove it, as it was hampering
development in that repo.

Tested:  Ran build-unit-test-docker.sh and run-unit-test-docker.sh

Change-Id: Ie107ba4902fb205377789a614a325ea28f918e68
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
1 file changed