+ build-fix for pmake with libtool.
+ improve make-tar.sh scripts, adding COPYING to tar file, and clean up
shellcheck warnings.
+ add link for "reset6" manpage in test-package ncurses6-doc
+ revise configure option --with-pkg-config-libdir, using the actual
search path from pkg-config or pkgconf using the output from --debug
(report by Pascal Pignard).
+ freeze ABI in ".map" files.