[Bug preprocessor/64220] gcc preprocessor defines outside of the reserved namespace: unix linux AVR

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64220

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
https://gcc.gnu.org/onlinedocs/gcc-4.9.2/cpp/System-specific-Predefined-Macros.html#System-specific-Predefined-Macros