Fixes #4931.

Possibly because of that numeric_limits<FP> are implemeted as full specializations, when one attempts use min() or epsilon(), Clang emits warning for Nan and Inf related functions, even if these functions are not themselves called.

This PR suppresses -Wnan-infinity-disabled in <limits> and <cmath> locally to avoid such false positives. When a user explicitly calls infinity(), quiet_NaN(), or signaling_NaN(), the warning is still triggered (Godbolt link).