[Bug ada/65102] gnat-style.texi warning from including fdl.texi

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65102

--- Comment #11 from vries at gcc dot gnu.org ---
(In reply to vries from comment #10)
> We better ask Gerard what he meant.

https://gcc.gnu.org/ml/gcc-patches/2015-12/msg00823.html