[Bug c++/69462] FLT_EVAL_METHOD and DECIMAL_DIG missing in float.h

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69462

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes, but I can't approve changes to that part of GCC and it should probably
wait for stage 1.