- Do not overwrite PKG_CONFIG_PATH for new tack support

- Add ncurses patch 20230429
+ revise recent change to _nc_write_entry to isolate it to a Cygwin bug
(cf: 20230311)
+ amend fix for wgetnstr, wgetn_wstr to use cbreak mode unless raw
mode was set (cf: 20210522).
+ fix a few warnings from cppcheck, etc.
+ correct copy/paste error in nc_access.h (report by Werner Fink).
- Adopt patch ncurses-6.4-makeuseof_secure_open.dif
* Fix yet an other copy/paste typo

- Add patch ncurses-6.4-makeuseof_secure_open.dif
* Really make use of _nc_safe_fopen() and _nc_safe_open3()

- Add ncurses patch 20230424
+ check return value of _nc_save_str(), in special case for tic where
extended capabilities are processed but the terminal description was
not initialized (report by Ziqiao Kong).
+ regenerate llib-* files.

- Add ncurses patch 20230423 (boo#1210552)
+ add tiscan_s() to help applications check formatting capabilities
that would be passed to tiparm_s, etc.
+ add tiparm_s() to provide applications a way to tell ncurses what
the expected parameters are for a capability (tmux #3531).
+ improve check in lib_tparm.c, ensuring that a char* fits into a
TPARM_ARG.
+ add --disable-setuid-environ configure option (request by Sven
Joachim).