removed unused 'make version' target: there should be one place where the version is updated

Makefile

-VERSION = 0.9.6.3
 PYTHON?=python
 
-version:
-	@echo "Setting version to $(VERSION)"
-	@echo "version = '$(VERSION)'" > Cython/Compiler/Version.py
-
 clean:
 	@echo Cleaning Source
 	@rm -f *.pyc */*.pyc */*/*.pyc