ncurses 5.9 - patch 20140426

+ add --disable-lib-suffixes option (adapted from patch by Juergen
  Pfeifer).
+ merge some changes from Juergen Pfeifer's work with MSYS2, to
  simplify later merging:
  + use NC_ISATTY() macro for isatty() in library
  + add _nc_mingw_isatty() and related functions to windows-driver
  + rename terminal driver entrypoints to simplify grep's
+ remove a check in the sp-funcs flavor of newterm() which allowed only
  the first call to newterm() to succeed (report by Thomas Beierlein,
  cf: 20090927).