[Bug c++/65152] Several friend function definitions break lookup

[rogero at howzatt dot demon.co.uk]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65152

--- Comment #3 from Roger Orr <rogero at howzatt dot demon.co.uk> ---
Note that this has been fixed in gcc-trunk (tested 22-Aug-2015)