[Bug middle-end/95472] various diagnostics for C/C++ hyperlinks to gfortran doc

[xry111 at mengyan1223 dot wang]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95472

--- Comment #3 from Xi Ruoyao <xry111 at mengyan1223 dot wang> ---
Well, seems fixed by Jakub at efaffc69 (in master) and a764bbb7 (in gcc-10) so
far.