[IOT-2060] Don't force-link with routingmanager

[IOT-2060] Don't force-link with routingmanager

Don't force all IoTivity modules to link with routingmanager. Many
modules use the copy of routingmanager from the Shared Library
octbstack, so they don't need to link with routingmanager.

Also routingmanager currently calls into connectivity_abstraction, so
it adds unnecessary headaches when having to specify LIBS in the
strict order required by the gcc linker.

Change-Id: I1e262e62fecd0c01528d07170b8f115ba7fecd5e
Signed-off-by: Dan Mihai <Daniel.Mihai@microsoft.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/19101
Tested-by: jenkins-iotivity <jenkins@iotivity.org>