- Add ncurses patch 20210718
+ correct typo in "vip" comments (report by Nick Black), reviewed this
against Glink manual -TD
+ fill in some missing pieces for pccons, to make it comparable to the
vt220 entry -TD
+ modify mk-1st.awk to account for extra-suffix configure option
(report by Juergen Pfeifer).
+ change default for --disable-wattr-macros option to help packagers
who reuse wide ncursesw header file with non-wide ncurses library.
+ build-fix for test/test_opaque.c, for configurations without opaque
curses structs.

- Add ncurses patch 20210710
+ improve history section for tset manpage based on the 1BSD tarball,
which preceded BSD's SCCS checkins by more than three years.
+ improve CF_XOPEN_CURSES macro used in test/configure (report by Urs
Jansen).
+ further improvement of libtool configuration, adding a dependency of
the install.tic rule, etc., on the library in the build-tree.
+ update config.sub

- Add ncurses patch 20210703
+ amend libtool configuration to add dependency for install.tic, etc.,
in ncurses/Makefile on the lower-level libraries.
+ modify configure script to support ".PHONY" make program feature.
- Correct offsets of patch ncurses-6.2.dif