Per discussion on gentoo-dev with Sylvain <asm8@wanadoo.fr>, I've patched the busybox ebuild. Also noted an outstanding bug relating to homepage in #15784, that is fixed in this patch as well. One might still fix the homepages in the ~arch ebuilds remaining...
Created attachment 10144 [details, diff] busybox-0.60.3.ebuild.patch
sorry, your patch didn't work added the change manually