f67a0393c5
Adds support for c++11 'enum class foo' constructs per https://www.riverbankcomputing.com/static/Docs/sip/incompatibilities.html#sip-v4-19-4 - required by upcoming qgis 3.8. Went in a bulk build without fallout. Also tested by Caspar Schutijser with tortoisehg.