libexpat: remove platfor+arch specific gyp code
libexpat: remove platfor+arch specific gyp code

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