ncurses 5.9 - patch 20130406

ncurses 5.9 - patch 20130406

+ improve parameter checking in copywin().
+ modify configure script to work around OS X's "libtool" program, to
  choose glibtool instead.  At the same time, chance the autoconf macro
  to look for a "tool" rather than a "prog", to help with potential use
  in cross-compiling.
+ separate the rpath usage for c++ library from demo program
  (Redhat #911540)
+ update/correct header-dependencies in c++ makefile (report by Werner
  Fink).
+ add --with-cxx-shared to dpkg-script, as done for rpm-script.