Fix Python native module file extension.  It's apparently .so even on OS X.
Fix Python native module file extension.  It's apparently .so even on OS X.

libmapper/libmapper,libmapper/libmapper,davidhernon/libmapper-admin2,radarsat1/libmapper,davidhernon/libmapper,libmapper/libmapper,malloch/libmapper,malloch/libmapper,radarsat1/libmapper,davidhernon/libmapper-admin2,davidhernon/libmapper-admin2,radarsat1/libmapper,malloch/libmapper,malloch/libmapper,johnty/libmapper,davidhernon/libmapper-admin2,malloch/libmapper,libmapper/libmapper,davidhernon/libmapper,davidhernon/libmapper,radarsat1/libmapper,johnty/libmapper,radarsat1/libmapper,johnty/libmapper,davidhernon/libmapper,davidhernon/libmapper,libmapper/libmapper,johnty/libmapper,davidhernon/libmapper-admin2,libmapper/libmapper,malloch/libmapper,johnty/libmapper