ui.backend.gtk: don't enable gtk UI backend by default on Mac OS X. Fixes #40
ui.backend.gtk: don't enable gtk UI backend by default on Mac OS X. Fixes #40

factor/factor,dch/factor,nicolas-p/factor,dch/factor,slavapestov/factor,factor/factor,nicolas-p/factor,dch/factor,nicolas-p/factor,tgunr/factor,slavapestov/factor,bpollack/factor,factor/factor,tgunr/factor,slavapestov/factor,mrjbq7/factor,sarvex/factor-lang,sarvex/factor-lang,mrjbq7/factor,bpollack/factor,slavapestov/factor,bjourne/factor,dch/factor,bpollack/factor,mrjbq7/factor,nicolas-p/factor,tgunr/factor,bjourne/factor,bjourne/factor,slavapestov/factor,slavapestov/factor,factor/factor,tgunr/factor,sarvex/factor-lang,bjourne/factor,nicolas-p/factor,AlexIljin/factor,AlexIljin/factor,sarvex/factor-lang,AlexIljin/factor,factor/factor,mrjbq7/factor,tgunr/factor,slavapestov/factor,bjourne/factor,dch/factor,mrjbq7/factor,bpollack/factor,bjourne/factor,tgunr/factor,mrjbq7/factor,AlexIljin/factor,AlexIljin/factor,sarvex/factor-lang,bpollack/factor,AlexIljin/factor,sarvex/factor-lang,factor/factor,bjourne/factor,nicolas-p/factor,nicolas-p/factor,bpollack/factor,sarvex/factor-lang,AlexIljin/factor,dch/factor,bpollack/factor