ncurses: Remove version 5.4

It's not used anywhere, and doesn't build:

http://hydra.nixos.org/build/7204910

pkgs/development/libraries/ncurses/5_4.nix

@@ -1,75 +0,0 @@
-{stdenv, fetchurl, unicode ? true}:
-
-let
-  /* C++ bindings fail to build on `i386-pc-solaris2.11' with GCC 3.4.3:
-     <http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6395191>.
-     It seems that it could be worked around by #including <wchar.h> in the
-     right place, according to
-     <http://mail.python.org/pipermail/python-bugs-list/2006-September/035362.html>,
-     but this is left as an exercise to the reader.
-     So disable them for now.  */
-  cxx = stdenv.system != "i686-solaris";
-in
-stdenv.mkDerivation (rec {
-  name = "ncurses-5.4";
-
-  src = fetchurl {
-    url = "mirror://gnu/ncurses/${name}.tar.gz";
-    sha256 = "0div11f5flig67v702fd3sj362zagrnaj0d8wvs905s3rxiy1g2s";
-  };
-
-  configureFlags = ''
-    --with-shared --includedir=''${out}/include --without-debug
-    ${if unicode then "--enable-widec" else ""}${if cxx then "" else "--without-cxx-binding"}
-  '';
-
-  selfNativeBuildInput = true;
-
-  enableParallelBuilding = true;
-
-  preBuild =
-    # On Darwin, we end up using the native `sed' during bootstrap, and it
-    # fails to run this command, which isn't needed anyway.
-    stdenv.lib.optionalString (!stdenv.isDarwin)
-    ''sed -e "s@\([[:space:]]\)sh @\1''${SHELL} @" -i */Makefile Makefile'';
-
-  # When building a wide-character (Unicode) build, create backward
-  # compatibility links from the the "normal" libraries to the
-  # wide-character libraries (e.g. libncurses.so to libncursesw.so).
-  postInstall = if unicode then ''
-    ${if cxx then "chmod 644 $out/lib/libncurses++w.a" else ""}
-    for lib in curses ncurses form panel menu; do
-      if test -e $out/lib/lib''${lib}w.a; then
-        rm -f $out/lib/lib$lib.so
-        echo "INPUT(-l''${lib}w)" > $out/lib/lib$lib.so
-        ln -svf lib''${lib}w.a $out/lib/lib$lib.a
-        ln -svf lib''${lib}w.so.5 $out/lib/lib$lib.so.5
-      fi
-    done;
-  '' else "";
-
-  meta = {
-    description = "GNU Ncurses, a free software emulation of curses in SVR4 and more";
-
-    longDescription = ''
-      The Ncurses (new curses) library is a free software emulation of
-      curses in System V Release 4.0, and more.  It uses Terminfo
-      format, supports pads and color and multiple highlights and
-      forms characters and function-key mapping, and has all the other
-      SYSV-curses enhancements over BSD Curses.
-
-      The ncurses code was developed under GNU/Linux.  It has been in
-      use for some time with OpenBSD as the system curses library, and
-      on FreeBSD and NetBSD as an external package.  It should port
-      easily to any ANSI/POSIX-conforming UNIX.  It has even been
-      ported to OS/2 Warp!
-    '';
-
-    homepage = http://www.gnu.org/software/ncurses/;
-
-    license = "X11";
-
-    maintainers = [ stdenv.lib.maintainers.ludo ];
-    platforms = stdenv.lib.platforms.all;
-  };
-} // ( if stdenv.isDarwin then { postFixup = "rm $out/lib/*.so"; } else { } ) )

pkgs/top-level/all-packages.nix

@@ -5297,15 +5297,7 @@ let
 
   nanomsg = callPackage ../development/libraries/nanomsg { };
 
-  ncurses_5_4 = makeOverridable (import ../development/libraries/ncurses/5_4.nix) {
+  ncurses = callPackage ../development/libraries/ncurses {
-    inherit fetchurl;
-    unicode = system != "i686-cygwin";
-    stdenv = if stdenv.isDarwin
-      then allStdenvs.stdenvNative
-      else stdenv;
-  };
-  ncurses_5_9 = makeOverridable (import ../development/libraries/ncurses) {
-    inherit fetchurl;
     unicode = system != "i686-cygwin";
     stdenv =
       # On Darwin, NCurses uses `-no-cpp-precomp', which is specific to
@@ -5315,7 +5307,6 @@ let
       then allStdenvs.stdenvNative
       else stdenv;
   };
-  ncurses = ncurses_5_9;
 
   neon = callPackage ../development/libraries/neon {
     compressionSupport = true;