Makefile: make config.mk the dependency of object files
diff --git a/Makefile b/Makefile
index 870433a..30cc5f1 100644
--- a/Makefile
+++ b/Makefile
@@ -254,6 +254,8 @@
 $(LIBRARY): $(LIBOBJ)
 	$(CC) $(LDFLAGS) $(LIBOBJ) -o $(LIBRARY)
 
+$(LIBOBJ): config.mk
+
 $(LIBOBJ_ARM): $(DEP_ARM)
 $(LIBOBJ_ARM64): $(DEP_ARM64)
 $(LIBOBJ_MIPS): $(DEP_MIPS)