normalize osx to darwin so python meterp works

modules/post/multi/gather/wlan_geolocate.rb

@@ -114,9 +114,9 @@ class Metasploit3 < Msf::Post
     else
       # For Meterpreter use the sysinfo OS since java Meterpreter returns java as platform
       platform = session.sys.config.sysinfo['OS']
+      platform = 'osx' if platform =~ /darwin/i
     end
 
-
     case platform
     when /win/i