ncurses 6.2 - patch 20201114

ncurses 6.2 - patch 20201114

+ fix some compiler-warnings in experimental Windows-10 driver.
+ modify a check for parameters in terminfo capabilities to handle the
  special case where short extended capability strings were not
  converted from terminfo to termcap format.
+ modify CF_MIXEDCASE_FILENAMES macro, adding darwin as special case
  when cross-compiling (report by Eli Rykoff).