+20210313
+ + improve configure CF_LD_SEARCHPATH macro used for ncurses*-config and
+ ".pc" files, from dialog changes.
+ + reduce dependency of math-library in test programs.
+ + minor fixes for test_tparm.c (cf: 20210306)
+ + mention "ncurses" prefix in curses_version() manpage (report by
+ Michal Bielinski).
+