Most of the changes needed to support Windows native clean; distclean is has a problem

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5367 42af7a65-404d-4744-a932-0658087f49c3

apps/examples/sendmail/Makefile

@@ -87,12 +87,13 @@ context:
 depend: .depend
 
 clean:
-	@rm -f *.o *~ .*.swp .built
+	$(call DELFILE .built)
 	$(call CLEAN)
 	@$(MAKE) -f Makefile.host clean TOPDIR="$(TOPDIR)" APPDIR="$(APPDIR)"
 
 distclean: clean
-	@rm -f Make.dep .depend
+	$(call DELFILE Make.dep)
+	$(call DELFILE .depend)
 
 -include Make.dep
 

apps/examples/sendmail/Makefile.host

@@ -71,7 +71,9 @@ $(BIN): headers $(OBJS)
 	$(HOSTCC) $(HOSTLDFLAGS) $(OBJS) -o $@
 
 clean:
-	@rm -f $(BIN).* *.o1 *~
+	$(call DELFILE $(BIN).*)
+	$(call DELFILE *.o1)
+	$(call CLEAN)
 	@rm -rf include