draft: adjusted for Intel oneAPI

[MarDiehl]

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works with 2024.2.1. PCH handling and Fortran compiler are not version dependent, probably breaks older systems

Proposed changes

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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 checked that tests pass locally with my changes
• [ ] I added tests that prove my fix is effective or that my feature works
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Further comments

Intel oneAPI contains new, LLVM-based compilers which have some incompatibilities to the older compilers. This makes b2 work with these new compilers.

Note: I believe that this change does not work on older systems, but to make it compatible I need help for writing jam files and, ideally, setting up a CI for Intel compiler

@hainest: This seems to be the place for the changes