fixed build for msvc 14.3 with Visual Studio 17.10 or newer

[tobias-loew]

recognition of msvc toolset v143 for Visual Studio 17.10 or newer did not work

Proposed changes

Checking also for prefix 14.4

Types of changes

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• [x ] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Documentation content changes
• [ ] Other (please describe):

Checklist

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• [ x] I searched the discussions
• [ x] I searched the closed and open issues
• [ x] I read the contribution guidelines
• [ ] I added myself to the copyright attributions for significant changes
• [ x] I checked that tests pass locally with my changes
• [ ] I added tests that prove my fix is effective or that my feature works
• [ ] I added necessary documentation (if appropriate)

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[Nekto89]

I've applied this patch on top of b2 4.10.1 and it helped me to build Boost 1.84.0 with VS2022 Update 10 Preview 6 through conan.

[grafikrobot]

Fixed with https://github.com/bfgroup/b2/commit/2d756eb245e9898cbeb3212ca1716038927329a8