win,node-gyp: enable delay-load hook by default

The delay-load hook allows node.exe/iojs.exe to be renamed. See efadffe
for more background.

This commit is a combined squash of the following previous patches:
ba93c58,
3bda6cb,
0d6d3dd.

PR-URL: nodejs/node#1763
Reviewed-By: Jeremiah Senkpiel <[email protected]>

Author: piscisaureus