#246 Support for MSVC toolset version 14.40 in VS 2022

[Vidar Hasfjord]

With Visual Studio 2022 version 17.10, Microsoft upped the minor version number of the toolset and compiler to 40 (i.e. 14.40 and 19.40, respectively), thereby breaking the assumption in OWLNext (include/private/owllink.h (sourceforge.net)) that toolset "v143" in VS 2022 would have minor version numbers restricted to 3X and _MSC_VER within 1930-1939.

See: https://devblogs.microsoft.com/cppblog/msvc-toolset-minor-version-number-14-40-in-vs-2022-v17-10/

Reported by @patbir [discussion:00960e22aa].

[Vidar Hasfjord]

This feature was implemented on the trunk in [r6979] and merged into Owlet in [r6980] and into 6.36, 6.44 and 7.0 in [r6981].

[Ognyan Chernokozhev]

This VS versioning change is quite unfortunate, as it is not clear what the version of a future Visual C++ (2025?) would be and thus making it harder to future-proof OWLNext.

Chaning the check to
#if _MSC_VER >= 1950
is good enough, we will revisit it when new versions are released.