ncurses 6.4 - patch 20230418

ncurses 6.4 - patch 20230418

+ improve checks for limits on privileged execution:
  + modify _nc_syserr_abort() to use _nc_env_access(), rather than
    only checking root uid.
  + use getauxval() when available, to improve setuid/setgid checks.
  + modify test packages to disable root access/environ options.
+ modify tgoto() to accept no-parameter capabilities, for joe editor
  (OpenSUSE #1210485, Gentoo #904263).