A small change with build system (internal change)

Change-Id: Ie10e02495a38ba6582ea5822bed62a1baae86c8b
ndn-regexp: Allow back-referencing part of name components

This feature should be avoided as much as possible, but it is needed in
some special cases.

Change-Id: If1ac4348cf9e39cce2f5b5c7ac2592d4b3e326d8
ndn-regexp: Adding shortcut <> to reference any name component

Change-Id: I664ad17441c53f8776993c910a30649030241572