Using a Webassembly port of expat instead of compiling the expat binary

[marcocastignoli]

In order to have less dependecies it is possible to use a port of expat in Webassembly and call it directly in the node runtime instead of calling an external binary (compiled in C).

I found this library https://github.com/hildjj/expat-wasm that it aims to be as fast as the original C library.

What do you think about it?