[Bug 264297] _POSIX_C_SOURCE=200809L causes failure in #include <sstream>

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264297

            Bug ID: 264297
           Summary: _POSIX_C_SOURCE=200809L causes failure in #include
                    <sstream>
           Product: Base System
           Version: 13.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: standards
          Assignee: standards@FreeBSD.org
          Reporter: yuri@freebsd.org

This code:
> #define _POSIX_C_SOURCE 200809L
> #include <sstream>

fails:

$ c++ x.cpp 
In file included from x.cpp:3:
In file included from /usr/include/c++/v1/sstream:184:
In file included from /usr/include/c++/v1/istream:163:
In file included from /usr/include/c++/v1/ostream:138:
In file included from /usr/include/c++/v1/ios:214:
/usr/include/c++/v1/__locale:637:16: error: use of undeclared identifier
'isascii'
        return isascii(__c) ? (__tab_[static_cast<int>(__c)] & __m) !=0 :
false;
               ^
/usr/include/c++/v1/__locale:644:22: error: use of undeclared identifier
'isascii'
            *__vec = isascii(*__low) ? __tab_[static_cast<int>(*__low)] : 0;
                     ^
/usr/include/c++/v1/__locale:652:17: error: use of undeclared identifier
'isascii'
            if (isascii(*__low) && (__tab_[static_cast<int>(*__low)] & __m))
                ^
/usr/include/c++/v1/__locale:661:19: error: use of undeclared identifier
'isascii'
            if (!(isascii(*__low) && (__tab_[static_cast<int>(*__low)] & __m)))
                  ^
4 errors generated.

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