cmake: improve platform/compiler/architecture detection and make cross-building to QNX on Windows possible #137
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Subject
This PR adapts the platform/compiler/architecture extraction logic to allow cross-builds to QNX on Windows. It also unifies some logic and adds VS2022 detection, with a new fallback for 'unknown' MSVC toolset versions.
It also adapts the QNX toolchain base file to skip settings the rpath on the build-artifacts which is extremely broken on Windows. Since the QNX binaries (e.g., test executables) cannot be executed on the host (not the cross-build target) anyway, this shouldn't break anything.
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