ncurses 5.9 - patch 20120922

ncurses 5.9 - patch 20120922

+ modify setupterm to set its copy of TERM to "unknown" if configured
  for the terminal driver and TERM was null or empty.
+ modify treatment of TERM variable for MinGW port to allow explicit
  use of the windows console driver by checking if $TERM is set to
  "#win32con" or an abbreviation of that.
+ undo recent change to fallback definition of vsscanf() to build with
  older Solaris compilers (cf: 20120728).
  to help with MinGW port.
+ modifications for MinGW port to make wide-character display usable.