+20200817
+ + reduce build-warnings by excluding ncurses-internals from deprecation
+ warnings.
+ + mark wgetch-events feature as deprecated.
+ + add definition for $(LIBS) to ncurses/Makefile.in, to simplify builds
+ using the string-hacks option.
+ + prevent KEY_EVENT from appearing in curses.h unless the configure
+ option --enable-wgetch-events is used (report by Werner Fink).
+