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

[pinskia at gcc dot gnu.org]

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

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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   Target Milestone|7.0                         |---