[Bug 264730] clang++ -fmodules fails when using stdout from cstdio: error: declaration of '__stdoutp' must be imported from module 'std.iosfwd' before it is required

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264730

--- Comment #7 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Mark Millard from comment #6)

If a #include lists a importable header, it is implementation
defined for if the #include is replaced by an import directive
for the header in question or not.

But <cstdio> does not have to be importable: it is not listed
in Table 21 of, for example, INCITS/ISO/IEC 14882:2020 (2021).

So it appears that definitions outside 14882:2020 need to be
used to establish the expected (but not necessarily portable)
behavior for the example.

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