ncurses 6.4 - patch 20231001

ncurses 6.4 - patch 20231001

+ modify setupterm to provide for using ANSI cursor-position report (in
  user6/user7 terminfo capabilities) to obtain screensize if neither
  environment variables or ioctl is used.  The ncurses test-program
  with options "-E -T" demonstrates this feature.
+ improve error messages in tic (patch by Branden Robinson).
+ improve formatting/style of manpages (patches by Branden Robinson).
+ modify test/clip_printw.c to optionally test non-wrapped updates.
+ fix reallocation loop for vsnprintf() in _nc_sprintf_string() by
  copying the va_list variable (patch by Ian Abbott).