Disable default make rules

- This should hopefully stop making from being extra smart and trying to
run yacc and rebuild tools in the kernel tree.

Change-Id: I11601f96543b7b6b877b7411515e45f27099cd44
diff --git a/docker.mk b/docker.mk
index f208134..1669e7a 100644
--- a/docker.mk
+++ b/docker.mk
@@ -94,5 +94,7 @@
 	@rm -f hello.c hello
 
 .DEFAULT_GOAL:=docker-all
+.MAKEFLAGS += --no-builtin-rules
+.SUFFIXES:
 
 .PHONY:: docker-build