You need to generate the patch from the top of the wine directory. You also need to use your real name for copyright-tracking purposes.
"copyright-tracking purposes"
is there a Wiki page that explains this to the uninitiated ? I looked, did not find. Google led me straight back to the cited post on wine-devel@winehq.org.
and there was me thinking you wanted my real name so I could take all your feedback personally. ;)