emacs: include cf-private on darwin and don't propagate frameworks

    Undefined symbols for architecture x86_64:
      "_CFNotificationCenterAddObserver", referenced from:
          _macfont_copy_available_families_cache in macfont.o
      "_CFNotificationCenterGetLocalCenter", referenced from:
          _macfont_copy_available_families_cache in macfont.o
      "_NSDefaultRunLoopMode", referenced from:
          _ns_send_appdefined in nsterm.o
          -[EmacsApp run] in nsterm.o
      "_OBJC_CLASS_$_NSArray", referenced from:
          objc-class-ref in nsterm.o
          objc-class-ref in nsmenu.o
          objc-class-ref in nsselect.o
      "_OBJC_CLASS_$_NSData", referenced from:
          objc-class-ref in nsimage.o
      "_OBJC_CLASS_$_NSDate", referenced from:
          objc-class-ref in nsterm.o
      "_OBJC_CLASS_$_NSDictionary", referenced from:
          objc-class-ref in macfont.o
      "_OBJC_CLASS_$_NSLocale", referenced from:
          objc-class-ref in nsterm.o
      "_OBJC_CLASS_$_NSMutableArray", referenced from:
          objc-class-ref in nsterm.o
          objc-class-ref in nsmenu.o
      "_OBJC_CLASS_$_NSMutableDictionary", referenced from:
          objc-class-ref in nsmenu.o
          objc-class-ref in nsselect.o
      "_OBJC_CLASS_$_NSMutableSet", referenced from:
          objc-class-ref in nsterm.o
      "_OBJC_CLASS_$_NSRunLoop", referenced from:
          objc-class-ref in nsmenu.o
      "_OBJC_CLASS_$_NSTimer", referenced from:
          objc-class-ref in nsterm.o
          objc-class-ref in nsmenu.o
      "_OBJC_CLASS_$_NSURL", referenced from:
          objc-class-ref in nsterm.o
          objc-class-ref in nsfns.o
      "_OBJC_CLASS_$_NSUserDefaults", referenced from:
          objc-class-ref in nsterm.o
          objc-class-ref in nsfns.o
      "_OBJC_EHTYPE_$_NSException", referenced from:
          GCC_except_table8 in nsterm.o
          GCC_except_table1 in nsselect.o
    ld: symbol(s) not found for architecture x86_64