MSVC Builds: Silence Cogl Deprecation Warnings

Cogl-1.16 has much deprecation that is done, which causes the build of
Clutter to generate lots of C4996 (deprecation) warnings.  As in commit
fa8809d7 (Add COGL_DISABLE_DEPRECATION_WARNINGS to the build flags), do
likewise by adding this macro in the Visual C++ property sheets, so we
would have much less C4996 warnings during the build.

Please see bug 703877 for the rationale behind this.