ncurses 5.7 - patch 20090927

ncurses 5.7 - patch 20090927

+ move leak-checking for comp_captab.c into _nc_leaks_tinfo() since
  that module since 20090711 is in libtinfo.
+ add configure option --enable-term-driver, to allow compiling with
  terminal-driver.  That is used in mingw port, and (being somewhat
  more complicated) is an experimental alternative to the conventional
  termlib internals.  Currently, it requires the sp-funcs feature to
  be enabled.
+ completed integrating "sp-funcs" by Juergen Pfeifer in ncurses
  library (some work remains for forms library).