+20120707
+ + add ncurses_mingw.h to installed headers (prompted by patch by
+ Juergen Pfeifer).
+ + clarify return-codes from wgetch() in response to SIGWINCH (prompted
+ by Novell #769788).
+ + modify resizeterm() to always push a KEY_RESIZE onto the fifo, even
+ if screensize is unchanged. Modify _nc_update_screensize() to push a
+ KEY_RESIZE if there was a SIGWINCH, even if it does not call
+ resizeterm(). These changes eliminate the case where a SIGWINCH is
+ received, but ERR returned from wgetch or wgetnstr because the screen
+ dimensions did not change (Novell #769788).
+