Update ncurses to 5.0. From the release notes:

   We decided to release ncurses as a new whole number release (5.0)
   because it incorporates several interface changes, including some that
   would invalidate existing shared libraries. These are the highlights
   from the change-log since ncurses 4.2 release.

   Interface changes:
     * The principal source of changes to the interface comes from the
       release of X/Open Curses in 1997. Earlier versions of ncurses (4.0
       and before) were based on a draft version of the specification.
       The release version adds parameters to some functions to support
       the evolving internationalization of curses. These summarize the
       impact:
          + modified several prototypes to correspond with 1997 version
            of X/Open Curses (affects ABI since developers have used
            attr_get).
          + corrected prototypes for slk_* functions, using chtype rather
            than attr_t.
          + the slk_attr_{set,off,on} functions need an additional void*
            parameter according to XSI.
          + correct macros for wattr_set, wattr_get, separate wattrset
            macro from these to preserve behavior that allows attributes
            to be combined with color pair numbers.
          + reviewed/updated curses.h, term.h against X/Open Curses Issue
            4 Version 2. This includes making some parameters
            NCURSES_CONST rather than const, e.g., in termcap.h.
          + reviewed/corrected macros in curses.h as per XSI document.
          + add set_a_attributes and set_pglen_inch to terminfo
            structure, as per XSI and Solaris 2.5.
     * The newest version of the X/Open Curses is implemented on Solaris
       and other vendor's systems. It adds new features to the terminfo
       descriptions:
          + implement tparm %l format.
          + implement tparm printf-style width and precision for %s, %d,
            %x, %o as per XSI.
     * We made additional changes to reduce impact by future interface
       changes:
          + rename key_names[] array to _nc_key_names since it is not
            part of the curses interface.
          + move macro winch to a function, to hide details of struct
            ldat
     * modify configure script to embed ABI in shared libraries for HP-UX
       10.x (detailed request by Tim Mooney).
     * modify configuration of shared libraries on Digital Unix so that
       versioning is embedded in the library, rather than implied by
       links (patch by Tim Mooney).

   New features:
     * enable sigwinch handler by default.
     * turn on hashmap scrolling code by default
     * improved support for termcap applications
          + modify tput to accept termcap names as an alternative to
            terminfo names.
          + provide support for termcap PC variable by copying it from
            terminfo data and using it as the padding character in tputs.
          + provide support for termcap ospeed variable by copying it
            from the internal cur_term member, and using ospeed as the
            baudrate reference for the delay_output and tputs functions.
          + change name-comparisons in lib_termcap to compare no more
            than 2 characters.
          + add configure option --enable-tcap-names, which essentially
            allows users to define new capabilities as in termcap.
     * add mouse support to ncurses menus.
     * add mouse and dll support for OS/2 EMX
     * modify terminfo parsing to accept octal and hexadecimal constants
     * add configure option --enable-no-padding, to allow environment
       variable $NCURSES_NO_PADDING to eliminate non-mandatory padding,
       thereby making terminal emulators (e.g., for vt100) a little more
       efficient.
     * modify lib_color.c to eliminate dependency on orig_colors and
       orig_pair, since SVr4 curses does not require these either, but
       uses them when they are available.
     * add -f option to infocmp and tic, which formats the terminfo
       if/then/else/endif so that they are readable (with newlines and
       tabs).
     * modify tic to compile into %'char' form in preference to
       %{number}, since that is a little more efficient.

   Major bug fixes:
     * modify lib_tstp.c to block SIGTTOU when handling SIGTSTP, fixes a
       problem where ncurses applications which were run via a shell
       script would hang when given a ^Z. Also, check if the terminal's
       process group is consistent, i.e., a shell has not taken ownership
       of it, before deciding to save the current terminal settings in
       the SIGTSTP handler.
     * suppress sc/rc capabilities from terminal description if they
       appear in smcup/rmcup. This affects only scrolling optimization,
       to fix a problem reported by several people with xterm's alternate
       screen, though the problem is more general.
     * modify relative_move and tputs to avoid an interaction with the
       BSD-style padding. The relative_move function could produce a
       string to replace on the screen which began with a numeric
       character, which was then interpreted by tputs as padding.
     * modify setupterm so that cancelled strings are treated the same as
       absent strings, cancelled and absent booleans false (does not
       affect tic, infocmp).
     * modify lib_vidattr.c to allow for terminal types (e.g.,
       xterm-color) which may reset all attributes in the 'op'
       capability, so that colors are set before turning on bold and
       other attributes, but still after turning attributes off.
     * use 'access()' to check if ncurses library should be permitted to
       open or modify files with fopen/open/link/unlink/remove calls, in
       case the calling application is running in setuid mode.
     * correction to doupdate, for case where terminal does not support
       insert/delete character. The logic did not check that there was a
       difference in alignment of changes to old/new screens before
       repainting the whole non-blank portion of the line. Modified to
       fall through into logic that reduces by the portion which does not
       differ.

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