[Bug c++/93625] inline specifier in a friend function declaration

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93625

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This was changed for C++11 by
http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#281 and is a DR
against C++03 as well.