gzip: Update to 1.5

This fixes the gets() problem in gzip.

Also disabled "make check" because it depends on Perl and more/less,
which is undesirable in the stdenv bootstrap.

pkgs/tools/compression/gzip/default.nix

@@ -1,15 +1,13 @@
-{stdenv, fetchurl}:
+{ stdenv, fetchurl }:
 
-stdenv.mkDerivation (rec {
-  name = "gzip-1.4";
+stdenv.mkDerivation rec {
+  name = "gzip-1.5";
 
   src = fetchurl {
-    url = "mirror://gnu/gzip/${name}.tar.gz";
-    sha256 = "1vhiyzls60fws48scw48wvwn8mpv1f4yhcsnafys239qvb9wyrni";
+    url = "mirror://gnu/gzip/${name}.tar.xz";
+    sha256 = "0wx1nqk709kx75cwp2axachnbxryp4gyl06qxn5nl95184w0mhls";
   };
 
-  doCheck = true;
-
   meta = {
     homepage = http://www.gnu.org/software/gzip/;
     description = "Gzip, the GNU zip compression program";
@@ -31,13 +29,3 @@ stdenv.mkDerivation (rec {
     maintainers = [ stdenv.lib.maintainers.ludo ];
   };
 }
-
-//
-
-{
-  crossAttrs =
-    # XXX: Temporary workaround to allow GNU/Hurd builds with newer libcs.
-    (stdenv.lib.optionalAttrs (stdenv.cross.config == "i586-pc-gnu") {
-      patches = [ ./gets-undeclared.patch ];
-    });
-})

pkgs/tools/compression/gzip/gets-undeclared.patch

@@ -1,26 +0,0 @@
-This patch is needed to allow builds with newer versions of
-the GNU libc (2.16+).
-
-This is a backport of this patch:
-
-commit 66712c23388e93e5c518ebc8515140fa0c807348
-Author: Eric Blake <eblake@redhat.com>
-Date:   Thu Mar 29 13:30:41 2012 -0600
-
-    stdio: don't assume gets any more
-    
---- gzip/lib/stdio.in.h	2012-07-02 14:28:45.000000000 +0200
-+++ gzip/lib/stdio.in.h	2012-07-02 14:28:50.000000000 +0200
-@@ -160,12 +160,6 @@ _GL_WARN_ON_USE (fflush, "fflush is not
-                  "use gnulib module fflush for portable POSIX compliance");
- #endif
- 
--/* It is very rare that the developer ever has full control of stdin,
--   so any use of gets warrants an unconditional warning.  Assume it is
--   always declared, since it is required by C89.  */
--#undef gets
--_GL_WARN_ON_USE (gets, "gets is a security hole - use fgets instead");
--
- #if @GNULIB_FOPEN@
- # if @REPLACE_FOPEN@
- #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)