Bump IF97 revision to include recent patches (#1481)
Bump IF97 revision to include recent patches (#1481)

* Bump IF97 revision to include recent patches

* Fixed MSVC 2008 compatibility issues with externals/IF97

henningjp/CoolProp,CoolProp/CoolProp,CoolProp/CoolProp,CoolProp/CoolProp,henningjp/CoolProp,henningjp/CoolProp,CoolProp/CoolProp,henningjp/CoolProp,henningjp/CoolProp,CoolProp/CoolProp,henningjp/CoolProp,henningjp/CoolProp,CoolProp/CoolProp,CoolProp/CoolProp,CoolProp/CoolProp,henningjp/CoolProp