+ configure script rpath fixes from xterm #269.
+ workaround for cygwin's non-functional features.h, to force ncurses'
configure script to define _XOPEN_SOURCE_EXTENDED when building
wide-character configuration.
+ build-fix in run_tic.sh for OS/2 EMX install
+ add cons25-debian entry (patch by Brian M Carlson, Debina #607662).