+20210327
+ + build-fixes for Solaris10 /bin/sh
+ + fix some cppcheck warnings, mostly style, in ncurses test-programs,
+ form and menu libraries.
+
+20210323
+ + add configure option --enable-stdnoreturn, making the _Noreturn
+ keyword optional to ease transition (prompted by report by
+ Rajeev V Pillai).
+