Changes in coin to virtual machine template exposed a bug where older
windows version deadlocks jom in multithreaded environment.
-16 version of the windows 10 image is latest to include msvc2017,
update to this.
Task-number: COIN-598
Change-Id: Icc75ad4a6029332ebcd4acaad563156a139dc280
Reviewed-by: Heikki Halmet <heikki.halmet@qt.io>