Move the gmp dependency to nettle, where it originates.

As pointed out by Ludovic Courtès.

svn path=/nixpkgs/trunk/; revision=26812

pkgs/development/libraries/gnutls/default.nix

@@ -1,5 +1,5 @@
 { fetchurl, stdenv, zlib, lzo, libtasn1, nettle
-, guileBindings, guile, gmp }:
+, guileBindings, guile }:
 
 assert guileBindings -> guile != null;
 
@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
   buildInputs = [ zlib lzo libtasn1 ]
     ++ stdenv.lib.optional guileBindings guile;
 
-  propagatedBuildInputs = [ nettle gmp ];
+  propagatedBuildInputs = [ nettle ];
 
   doCheck = true;
 

pkgs/development/libraries/nettle/default.nix

@@ -9,7 +9,8 @@ stdenv.mkDerivation rec {
     sha256 = "0knp778738dpgbcj1yz54a7jsvmarfiafzl05z086bc470z6plmp";
   };
 
-  buildInputs = [ gmp gnum4 ];
+  buildInputs = [ gnum4 ];
+  propagatedBuildInputs = [ gmp ];
 
   doCheck = (stdenv.system != "i686-cygwin");