Require VS 2015 update 3 or higher

Change-Id: I7443f28ee75aa855d2c6cce237562acd7daacf43
Reviewed-by: Michael Brüning <michael.bruning@qt.io>
Reviewed-by: Peter Varga <pvarga@inf.u-szeged.hu>

tools/qmake/config.tests/winversion/winversion.cpp

+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtWebEngine module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#if !defined(_MSC_FULL_VER) || _MSC_FULL_VER < 190024213
+#error VS 2015 Update 3 with Cumulative Servicing Release or higher is required
+#endif
+
+int main(int, char **)
+{
+    return 0;
+}

tools/qmake/config.tests/winversion/winversion.pro

+CONFIG-=qt
+CONFIG+=console
+win32: SOURCES += winversion.cpp

tools/qmake/mkspecs/features/configure.prf

@@ -110,6 +110,10 @@ defineTest(runConfigure) {
         }
     }
 
+    win32 {
+        !config_winversion: skipBuild("Needs VS 2015 Update 3 with Cumulative Servicing Release or higher")
+    }
+
     isEmpty(skipBuildReason): {
         cache(CONFIG, add, $$list(webengine_successfully_configured))
         !isEmpty(WEBENGINE_CONFIG) {