Temporarily disable multithreaded on Jenkins for Windows.

Temporarily disable multithreaded on Jenkins for Windows.

This is to address random crashes with error 1033 like the following:
scons: *** [out\windows\amd64\debug\resource\IPCA\unittests\utresource\ipca\unittests\ipcatests] Error 1033

Change-Id: I4d2d47b495091fe325a7fe82b26fdf3a0e438ccb
Signed-off-by: Soemin Tjong <stjong@microsoft.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/18099
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Alex Kelley <alexke@microsoft.com>
Reviewed-by: Dan Mihai <Daniel.Mihai@microsoft.com>