Make make clean not only remove the object files, but also the library.

src/lib/Dirac/Makefile

@@ -54,4 +54,4 @@ libdirac.a:$(OBJECTS) Dirac.h
 	$(RANLIB) $@;
 
 clean:
-	rm *.o
+	rm *.o libdirac.a

src/lib/Radio/Makefile

@@ -35,4 +35,4 @@ libradio.a:$(OBJECTS) Radio.h
 	ar rv $@ $(OBJECTS); \
 	$(RANLIB) $@;
 clean:
-	rm *.o
+	rm *.o libradio.a