glcontext: wgl: Implement check_feature vfunc
There are several WGL specific extenstions such as WGL_NV_DX_interop. Currently we have no WGL specific extension support and this commit is also only for debugging purpose.
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There are several WGL specific extenstions such as WGL_NV_DX_interop. Currently we have no WGL specific extension support and this commit is also only for debugging purpose.