Enable more unit tests on Windows

Enable more unit tests on Windows

* Enable resource/c_common unit tests
* Enable resource/unittests binary (partially)
* Fix small unit test bugs related to MSVC
* Consolidate flags for gtest binaries on Windows

Change-Id: Iead5e4494f3cc0e597ccee4bd83e6d9978141972
Signed-off-by: David Antler <david.a.antler@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/11609
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Soemin Tjong <stjong@microsoft.com>
Reviewed-by: Phil Coval <philippe.coval@osg.samsung.com>
Reviewed-by: Dave Thaler <dthaler@microsoft.com>