[Bug libstdc++/69350] Don't define the C99 functions in -std=c++98 mode

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69350

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2016-01-18
            Version|5.3.1                       |6.0
   Target Milestone|---                         |7.0
     Ever confirmed|0                           |1