ncurses 6.1 - patch 20191019

ncurses 6.1 - patch 20191019

+ modify make_hash to not require --disable-leaks, to simplify building
  with address-sanitizer.
+ modify tic to exit if it cannot remove a conflicting name, because
  treating that as a partial success can cause an infinite loop in
  use-resolution (report/testcase by Hongxu Chen, cf: 20111001).