ncurses 6.4 - patch 20230415

ncurses 6.4 - patch 20230415

+ configure script fixes:
  + fix copy/paste error in configure option --disable-root-access
    (report/patch by Sven Joachim).
  + modify CF_XOPEN_SOURCE macro's amend default case to avoid
    undefining _XOPEN_SOURCE if _POSIX_C_SOURCE is defined.
+ modify test_tparm to account for extended capabilities.
+ add checks in tparm() and tiparm() for misuse of numeric parameters,
  overlooked in 20230408.
+ fix errata in clear.1 and curs_terminfo.3x