Fix the Mac OS notifier's issue with notice path.
Fix the Mac OS notifier's issue with notice path.

Use a static __noticePath to store the notice path. Method
pathForNoticesDirectory sometimes return bad memory value, so use
__noticePath to fetch the saved path.

rpassis/airbrake-ios,airbrake/airbrake-ios,rpassis/airbrake-ios,akio46/airbrake-ios,akio46/airbrake-ios,airbrake/airbrake-ios