Ben Boeckel 71f1483aac Tests/RunCMake/CXXModules: require transitive usages ...

Clang 17 is in a transition where it warns about transitive usages. Turn
it into an error if the flag is available to make sure we're testing the
feature properly.

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a.cxx

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b.cxx

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c.cxx

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CMakeLists.txt

Tests/RunCMake/CXXModules: require transitive usages

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d.cxx

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e.cxx

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main.cxx

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