ncurses 6.1 - patch 20190609

ncurses 6.1 - patch 20190609

+ add mintty, mintty-direct (adapted from patch by Thomas Wolff).
  Some of the suggested user-defined capabilities are commented-out,
  to allow builds with ncurses 5.9 and 6.0
+ add Smol/Rmol for tmux, vte-2018 (patch by Nicholas Marriott).
+ add rs1 to konsole, mlterm -TD
+ modify _nc_merge_entry() to make a copy of the data which it merges,
  to avoid modifying the source-data when aligning extended names.