The ebuild can be simply renamed from liquidwar-5.5.6.ebuild to liquidwar-5.5.7.ebuild and then run `ebuild liquidwar-5.5.7.ebuild digest` to generate the checksums.
all set now http://cvs.gentoo.org/cgi-bin/viewcvs.cgi/gentoo-x86/app-games/liquidwar/liquidwar-5.5.7.ebuild?rev=1.1&content-type=text/vnd.viewcvs-markup