Minimal implementation, make clean should work

rtl/dos/Makefile

@@ -0,0 +1,13 @@
+#
+# Minimalist version of a makefile, so make clean at least works.
+#
+.PHONY: clean install
+
+clean:
+	-$(MAKE) -C go32v2 clean
+	-$(MAKE) -C go32v1 clean
+
+install:
+	-$(MAKE) -C go32v2 install
+	-$(MAKE) -C go32v1 install
+