IOT-1448 - Fix Windows x86 Build issue

IOT-1448 - Fix Windows x86 Build issue

The affected test were processing the windows
include files before the iotivity_config.h
could set the preprocessor config.

Update callback calling convention

Change-Id: I9adbfafef2c2e1b117a37ad9003ff53bb0450656
Signed-off-by: Mike Fenelon <mike.fenelon@microsoft.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/13185
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: David Antler <david.a.antler@intel.com>
Reviewed-by: Dave Thaler <dthaler@microsoft.com>