[Bug libstdc++/71090] #include cannot locate math.h

[mcguire at crsr dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71090

--- Comment #1 from Tommy McGuire <mcguire at crsr dot net> ---
This may be related to Bug #70936
(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70936).