[Bug c/71914] Name 'DOMAIN' is blocked when including math.h

[henad221 at student dot liu.se]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71914

--- Comment #3 from henad221 at student dot liu.se ---
Thanks for quick reply. I didn't expect the name DOMAIN to be used by something
when including math.h. Thanks to Jakub for an explanation of what is happening,
next time I will try to dig more into these kinds of issues before posting it
as a bug.