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In #74516 the `SWIFT_NOEXCEPT` specifier is added to the imported Swift functions in C++ mode, but it is added after the function attributes. It seems that the tests only do `-fsyntax-only`, which seems not to catch an error like "expected function body after function declarator" when the header is used without that flag. Flip the attributes and the specifier around in the printer, and flip them in all the tests. The tests were using `%check-in-clang`, but it only checks importing as an objective-c-header. Add a parallel `%check-in-clang-cxx` to test also in C++. It uses C++17 because of some details in the imported headers and disables a warning about variadic macros that was promoted to an error and was blocking passing the tests. The clang-importer-sdk gets the minimal set of files to compile the two modified tests as C++. The files are mostly empty, except `cstddef` that imports the equivalent C header. Some modifications were needed in `ctypes.h` because the header was using features only available in C and not C++.