Patch libmhash to correct autotools config.h collision.

The autotools build was passing package generic parameters via config.h
in such a way as to generate name collisions with other autotool packages
using libmhash.

svn path=/nixpkgs/trunk/; revision=23380

pkgs/development/libraries/libmhash/default.nix

@@ -12,11 +12,15 @@ stdenv.mkDerivation rec {
     homepage = http://mhash.sourceforge.net;
     license = "LGPL";
   };
+
   pname = "mhash";
   version = "0.9.9.9";
   name = "${pname}-${version}";
+
   src = fetchurl {
     url = "mirror://sourceforge/${pname}/${name}.tar.bz2";
     sha256 = "1w7yiljan8gf1ibiypi6hm3r363imm3sxl1j8hapjdq3m591qljn";
   };
+
+  patches = [ ./autotools-define-conflict-debian-fix.patch ];
 }