remove thrift from makefile

Makefile

@@ -19,11 +19,3 @@ publish: build test benchmark
 	git push
 	git push --tags
 	gem push lightstep-tracer-`ruby scripts/version.rb`.gem
-
-# An internal LightStep target for regenerating the thrift protocol files
-.PHONY: thrift
-thrift:
-	thrift -r -gen rb -out lib/lightstep/tracer/thrift $(LIGHTSTEP_HOME)/go/src/crouton/crouton.thrift
-	rm lib/lightstep/tracer/thrift/reporting_service.rb
-	rm lib/lightstep/tracer/thrift/crouton_constants.rb
-	ruby scripts/patch_thrift.rb