Just copy the current, I've modified the patch so it will avoid strict aliasing QA issues.
Created attachment 107059 [details, diff] nsis-2.23-config.patch
Opened bug at upstream so we don't have to patch it next version... https://sourceforge.net/tracker/?func=detail&atid=373085&aid=1635841&group_id=22049
Heh... I've bumped nsis an hour ago! I've added the first chunk of your patch to mine and I've commited the new patch. Anyway, config.patch was not intended to be submitted upstream. Erasing stripping options from makefiles is a Gentoo-specific solution to a Gentoo-specific problem.