Make sure the apidocs are generated from the freshly built modules.

Makefile

@@ -121,7 +121,7 @@ ftest_build: build
 ftest_inplace: inplace
 	$(PYTHON) test.py -f $(TESTFLAGS) $(TESTOPTS)
 
-apidoc: apidocclean
+apidoc: apidocclean inplace3
 	@[ -x "`which sphinx-apidoc`" ] \
 		&& (echo "Generating API docs ..." && \
 			PYTHONPATH=src:$(PYTHONPATH) sphinx-apidoc -e -P -T -o doc/api src/lxml \