[IOT-1270] Fix building with SECURED=0 for Windows

[IOT-1270] Fix building with SECURED=0 for Windows

Don't try to link or export security-related APIs when SECURED=0.

Also, fix scons warning related to sqlite, in security/provisioning.

Change-Id: I61ddab0aeecdc917427bcc5051fb6be960b4b63f
Signed-off-by: Dan Mihai <Daniel.Mihai@microsoft.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/11533
Reviewed-by: Kevin Kane <kkane@microsoft.com>
Reviewed-by: David Antler <david.a.antler@intel.com>
Reviewed-by: Soemin Tjong <stjong@microsoft.com>
Reviewed-by: Dave Thaler <dthaler@microsoft.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>