Thanks!
What's the command to apply it to a build?
You need the
patch utility. There are a couple of implementations for windows out there. Just unpack the bitcoin sources into a directory, download the patch, open a
cmd window and type this:
> cd \path\to\bitcoin-sources
> patch -p1 < \path\to\vanity-0.3.23.patch
(Disclaimer: that's untested). Then compile as usual. I only compiled bitcoind (headless) since that's what I use anyway.
I think this is inherently a bad idea, especially coming from one of the core developers of bitcoin.
I understand he did it for the lulz and in no way he seriously endorses its usage. After all, you have to jump through a couple of hoops to get it working.