- Add ncurses patch 20211115 (boo##1192668)
+ fix memory-leak in delwin for pads (report by Werner Fink, OpenSUSE
#1192668, cf: 20211106),

- Add ncurses patch 20211113
+ minor clarification to clear.1 (Debian #999437).
+ add xterm+sl-alt, use that in foot+base (report by Jonas Grosse
Sundrup) -TD
+ improve search-path check for pkg-config, for Debian testing which
installs pkg-config with architecture-prefixes.
- Correct offsets of patch ncurses-6.3.dif

- Add ncurses patch 20211106
+ improve check in misc/Makefile.in for empty $PKG_CONFIG_LIBDIR
+ modify wnoutrefresh to call pnoutrefresh if its parameter is a pad,
rather than treating it as an error, and modify new_panel to permit
its window-parameter to be a pad (report by Giorgos Xou).
+ fix a memory-leak in del_curterm (prompted by discussion with Bram
Moolenaar, cf: 20210821).

- Add ncurses patch 20211030
+ simplify some references to WINDOWS._flags using macros.
+ add a "check" rule in Ada95 makefile, to help with test-packages.
+ build-fix for cross-compiling to MingW, conditionally add -lssp
- Correct offsets of patch ncurses-6.3.dif

- Add ncurses patch 20211026
+ corrected regex needed for older pkg-config used in Solaris 10.
+ amend configure option's auto-search to account for systems where
none of the directories known to pkg-config exist, adapted from