vici: Support out-of-tree build of Python Egg

We also don't require setup.py to exist during cleanup, as e.g. with
make distcheck the source directory is not writable when the build directory
is cleaned, so setup.py can't be created (to just get removed again anyway
if VICI and the Python Eggs haven't been enabled previously).

src/libcharon/plugins/vici/python/Makefile.am

@@ -8,21 +8,21 @@ EXTRA_DIST = LICENSE MANIFEST.in \
 	vici/protocol.py \
 	vici/session.py
 
-setup.py: $(srcdir)/setup.py.in
+$(srcdir)/setup.py: $(srcdir)/setup.py.in
 	$(AM_V_GEN) sed \
 	-e "s:@EGG_VERSION@:$(PACKAGE_VERSION):" \
 	$(srcdir)/setup.py.in > $@
 
 all-local: dist/vici-$(PACKAGE_VERSION)-py$(PYTHON_VERSION).egg
 
-dist/vici-$(PACKAGE_VERSION)-py$(PYTHON_VERSION).egg: $(EXTRA_DIST) setup.py
+dist/vici-$(PACKAGE_VERSION)-py$(PYTHON_VERSION).egg: $(EXTRA_DIST) $(srcdir)/setup.py
 	(cd $(srcdir); $(PYTHON) setup.py bdist_egg \
 		-b $(shell readlink -f $(builddir))/build \
 		-d $(shell readlink -f $(builddir))/dist)
 
-clean-local: setup.py
-	$(PYTHON) setup.py clean -a
-	rm -rf vici.egg-info dist setup.py
+clean-local:
+	(cd $(srcdir); [ ! -f setup.py ] || $(PYTHON) setup.py clean -a)
+	rm -rf $(srcdir)/setup.py $(srcdir)/vici.egg-info $(builddir)/dist
 
 install-exec-local: dist/vici-$(PACKAGE_VERSION)-py$(PYTHON_VERSION).egg
 	$(EASY_INSTALL) $(PYTHONEGGINSTALLDIR) \