ncurses 6.1 - patch 20181020

ncurses 6.1 - patch 20181020

+ ignore $TERMINFO as a default value in configure script if it came
  from the infocmp -Q option.
+ allow value for --with-versioned-syms to be a relative pathname
+ add a couple of broken-linker symbols to the list of versioned
  symbols to help with link-time optimization versus weak symbols.
+ apply shift/control/alt logic when decoding xterm's 1006 mode to
  wheel-mouse events (Redhat #1610681).