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Draft: cmVisualStudio10TargetGenerator: pass `-ifcOnly` where needed

Ben Boeckel requested to merge ben.boeckel/cmake:cxxmodules-vs-ifcOnly-flag into master

Compute .ifc filenames for synthetic target modules and add them to the build. Also manually add -scanDependencies since we do not have a command template to add it otherwise.

Fixes: #25328

TODO:

  • warnings about conflicting outputs when modules have the same base filename (as in export_bmi_and_interfaces)
  • dependencies do not seem to be hooked up correctly; modules from imported targets are not found properly: running the build doesn't build or scan the synthetic target's modules and neither does using --target to try to build the target directly.

Depends on !8892 (merged).

Backport: release

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