ncurses 6.4 - patch 20230107

ncurses 6.4 - patch 20230107

+ add --with-abi-altered configure option (prompted by discussion with
  Brian Inglis).
+ add BSD erase2 to characters handled by tset/reset.
+ improve configure-script macros vs compiler warnings.
+ regenerate configure scripts with autoconf 2.52.20221202
+ add RV report+version (suggested by Bram Moolenaar).
+ add comment to bracketed+paste explaining that vim patch 9.0.1117 is
  needed for use with the updated xterm descriptions (suggested by Bram
  Moolenaar).