Makefile: make the static build a non-phony target

Makefile

@@ -5,15 +5,15 @@ CPPFLAGS = `sed -ne '/^project (\([^ )]*\) VERSION \([^ )]*\).*/ \
 	s//-DPROJECT_NAME="\1" -DPROJECT_VERSION="\2"/p' CMakeLists.txt`
 
 sdn: sdn.cpp CMakeLists.txt
-	$(CXX) $(CXXFLAGS) $(CPPFLAGS) $< -o sdn \
+	$(CXX) $(CXXFLAGS) $(CPPFLAGS) $< -o $@ \
 	-lacl `pkg-config --libs --cflags ncursesw`
-static: sdn.cpp CMakeLists.txt
-	$(CXX) $(CXXFLAGS) $(CPPFLAGS) $< -o sdn \
+sdn-static: sdn.cpp CMakeLists.txt
+	$(CXX) $(CXXFLAGS) $(CPPFLAGS) $< -o $@ \
 	-static-libstdc++ \
 	-Wl,--start-group,-Bstatic \
 	-lacl `pkg-config --static --libs --cflags ncursesw` \
 	-Wl,--end-group,-Bdynamic
 clean:
-	rm -f sdn
+	rm -f sdn sdn-static
 
-.PHONY: static clean
+.PHONY: clean