* Problem: if IPC enabled libzmq does not compile when in uwp build

* Problem 10.0.##### can be valid windows target versions

* Problem: No builds are triggered on uwp platform

* Problem: epoll is set before UWP platform is checked

* Problem: used wrong CMAKE_SYSTEM_NAME specifier

* Problem: build tests fails during cmake configure

* Use Win32 build step for Win32-uwp platform

* Disable compile options that produce warnings that leads to a ci fail

* winnt version is set by cmake, no need for redefinition in windows.hpp

* Eliminate all warning according Incremental and opt:icf are specified

* Prefer to disable opt flags in debug config rather than incremental linking

* CMAKE_GENERATOR should not include uwp definition

* Add release build with uwp configuration

* Problem: pointer potentially uninitialized