build: Be sure to also include out/*.d in Makefile

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
diff --git a/Makefile b/Makefile
index 41bfcf4..1916ecf 100644
--- a/Makefile
+++ b/Makefile
@@ -281,4 +281,4 @@
 distclean: clean
 	$(Q)rm -f .config .config.old
 
--include $(patsubst %,$(OUT)%/*.d,$(DIRS))
+-include $(OUT)*.d $(patsubst %,$(OUT)%/*.d,$(DIRS))