Fix Issue #23356 - ImportC: The preprocessor is improperly invoked, on macOS, when cross-compiling.#23357
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…ed, on macOS, when cross-compiling.
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When DMD is run on macOS, the preprocessor is expected to be clang instead of GCC, and clang requires a different command-line than GCC does to solely preprocess a file without compiling and linking it.
DMD currently uses the clang-logic when the target is macOS--this is the wrong way 'round: the clang-logic should be used when the host is macOS.