35ed3fb43b
src/helper/HelperApp.cpp includes <utmpx.h> and writes utmpx login/logout records (setutxent/pututxline/updwtmpx). Redox has no utmp/utmpx login-accounting database -> "fatal error: utmpx.h: No such file". Guard the include and the utmpLogin/utmpLogout bodies under __redox__ as no-ops (login records are not tracked on Redox). The sddm daemon already links; this unblocks sddm-helper.