removed OSX requirements in Podspec
removed OSX requirements in Podspec

derrh/CanvasKit,nlambson/CanvasKit,instructure/CanvasKit,nlambson/CanvasKit,instructure/CanvasKit,nlambson/CanvasKit,nlambson/CanvasKit,instructure/CanvasKit,derrh/CanvasKit,instructure/CanvasKit,derrh/CanvasKit,derrh/CanvasKit