ANGLE builds on Windows with MSVC 2008 are not viable

Building ANGLE on Windows using Microsoft Visual Studio 2008 works fine, but the resulting build does not work properly (running `qmlscene.exe` with a simple QML file crashes).

This happens because _SECURE_SCL is enabled by default on Microsoft Visual Studio 2008 (this is no longer true on version 2010 and above; see http://msdn.microsoft.com/en-us/library/aa985896.aspx). Setting this to 0 fixes the build, but this should be done automatically.