[Bug libstdc++/79700] std::fabsf and std::fabsl missing from <cmath>

[kip at thevertigo dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79700

--- Comment #7 from Kip Warner <kip at thevertigo dot com> ---
Not if I want any certainty at compile time that it is single precision.