Align with bbfdm new design

src/Makefile

 LIBNETMNGR = libnetmngr.so
-LIBIFACESTACK = libinterface_stack.so
 
-LIBNETMNGROBJS = net_plugin.o common.o
-LIBIFACESTACKOBJS := interfacestack.o
+LIBNETMNGROBJS = net_plugin.o common.o interfacestack.o
 
 LIB_CFLAGS = $(CFLAGS) -Wall -Werror -fstrict-aliasing -g
 LIB_LDFLAGS = $(LDFLAGS)
@@ -47,14 +45,11 @@ endif
 %.o: %.c
 	$(CC) $(LIB_CFLAGS) $(FPIC) -c -o $@ $<
 
-all: $(LIBNETMNGR) $(LIBIFACESTACK)
+all: $(LIBNETMNGR)
 
 $(LIBNETMNGR): $(LIBNETMNGROBJS)
 	$(CC) $(LIB_CFLAGS) $(LIB_LDFLAGS) -shared -o $@ $^
 
-$(LIBIFACESTACK): $(LIBIFACESTACKOBJS)
-	$(CC) $(LIB_CFLAGS) $(LIB_LDFLAGS) -shared -o $@ $^
-
 clean:
-	rm -f *.o $(LIBNETMNGR) $(LIBIFACESTACK)
+	rm -f *.o $(LIBNETMNGR)