Add an 'export' target to the NuttX top-level Makefile

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3771 42af7a65-404d-4744-a932-0658087f49c3

arch/rgmp/src/Makefile

@@ -78,6 +78,12 @@ nuttx$(EXEEXT):
 	@$(OBJCOPY) -S -O binary $(TOPDIR)/$@ nuttx.img
 	@cp nuttx.img $(TOPDIR)/kernel.img
 
+# This is part of the top-level export target
+
+export_head:
+
+# Dependencies
+
 .depend: Makefile $(SRCS)
 	@$(MKDEP) $(CC) -- $(CFLAGS) -- $(SRCS) >Make.dep
 	@touch $@