Makefile: make the 'build' target the default

"make" with no argument will now be equivalent of "make build" instead
of "make clean"

Author: LudovicRousseau

Makefile

@@ -1,11 +1,11 @@
 PYTHON ?= python
 
-clean:
-	$(PYTHON) setup.py clean
-
 build:
 	$(PYTHON) setup.py build
 
+clean:
+	$(PYTHON) setup.py clean
+
 pypi: clean
 	# files generated by swig
 	rm -f smartcard/scard/scard.py