[Win32] Add conditional compilation directives.

[Win32] Add conditional compilation directives.

Several places, mostly related to networking and examples, needed
conditional compilation directives inserted.

Change-Id: Iad8f39c8ac28e760f5e3ded39d9c79b089aae6d7
Signed-off-by: Daniel Ferguson <daniel.j.ferguson@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/5507
Reviewed-by: David Antler <david.a.antler@intel.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>