Add a missing include for the C++ module build - #4868
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The std.h header uses types such as std::atomic and std::atomic_flag.
For the normal build mode, this header does include all the
headers it needs, such as <atomic>.
However when building the C++ module of {fmt}, the std.h header
omits such includes, and instead expects them to be included
beforehand by fmt.cc - which lacked including <atomic>.
This fixes building the C++ module with libc++ 23, which has removed
a number of unnecessary transitive includes.
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The std.h header uses types such as std::atomic and std::atomic_flag. For the normal build mode, this header does include all the headers it needs, such as .
However when building the C++ module of {fmt}, the std.h header omits such includes, and instead expects them to be included beforehand by fmt.cc - which lacked including .
This fixes building the C++ module with libc++ 23, which has removed a number of unnecessary transitive includes.