[Bug d/87818] D runtime does not build on FreeBSD.

[kargl at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87818

--- Comment #1 from kargl at gcc dot gnu.org ---
I poking through /usr/include, I find

% find /usr/include -type f | xargs grep ___wchar_t
/usr/include/x86/_types.h:typedef       int             ___wchar_t;
/usr/include/stddef.h:typedef   ___wchar_t      wchar_t;
/usr/include/wchar.h:typedef    ___wchar_t      wchar_t;
/usr/include/stdlib.h:typedef   ___wchar_t      wchar_t;
/usr/include/inttypes.h:typedef ___wchar_t      wchar_t;

It seems the D does not pick up the definition of ___wchar_t in
the x86/_typed.h header.