The bindnow-flags function (as well as the previous -Wl,-z,now direct LDFLAG) is now deprecated. The correct way to fix this is directly in the loader and modern GLIBC systems have this fixed already. Please get rid of bindnow-flags usage, thanks!
fixed in cvs http://sources.gentoo.org/sys-apps/utempter/utempter-0.5.5.6.ebuild?r1=1.14&r2=1.15