binding: add libexpat to the "dependecies", don't link to system expat
binding: add libexpat to the "dependecies", don't link to system expat

julianduque/node-expat,noahjs/node-expat,noahjs/node-expat,julianduque/node-expat,node-xmpp/node-expat,node-xmpp/node-expat,Moharu/node-expat,julianduque/node-expat,node-xmpp/node-expat,Moharu/node-expat,Moharu/node-expat,noahjs/node-expat