Log Message:
+ Drop ncurses dependency because it was only there for readline on
  Linux.  The readline buildlink3.mk file now pulls in the correct
  dependencies on its own.

+ Actually tell the configure script to use the readline dependency.

+ Add patch-ac which fixes the declaration of readline() to match the
  readline.h header (it takes a const char * argument).

+ Add full DESTDIR support.

Bump the PKGREVISION to 2.