Incorrect errno and code property values

[mscdex]

On Windows, if I get a socket error on node 0.8.14, the error object looks like this:

{ [Error: write Unknown system errno 10058]
  code: 'Unknown system errno 10058',
  errno: 'Unknown system errno 10058',
  syscall: 'write' }

[bnoordhuis]

Back-ported joyent/libuv@483043b to v0.8 in joyent/libuv@72955c2.