[Bug preprocessor/88966] Indirect stringification of "linux" produces "1"

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88966

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The same reason why:
#define mymacro 1

str(mymacro)
stringify(mymacro)

Gives different results.