[cxx-interop] Enable -verify-additional-file tests on Windows #80694
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These previously failed because they used '/' as the path separator instead of ''. While both are accepted on Windows, the latter is preferred and used to construct new paths, such as the path of imported header files. This inconsistency led to distinct buffer ID numbers being created (since paths are not canonicalized in BufferIdentIDMap), leading -verify to fail to associate the error emitted from the included file with the error expected in the -verify-additional-file file.
This patch re-enables these tests but uses %{fs-sep} in place of '/', to ensure the appropriate path separator is used for the platform where the test is run.
rdar://148928101