Something subtle changed, force math defines
Something subtle changed, force math defines

Primarily needed to ensure that the cmath header defines M_PI, which
stopped working on clean builds after the latest set of depdendency
updates on a clean build (but not an incremental build as I tested).

OpenChemistry/avogadrolibs,ghutchis/avogadrolibs,OpenChemistry/avogadrolibs,ghutchis/avogadrolibs,OpenChemistry/avogadrolibs,OpenChemistry/avogadrolibs,ghutchis/avogadrolibs,OpenChemistry/avogadrolibs,ghutchis/avogadrolibs,ghutchis/avogadrolibs