add statically linked curl binary for static nix environment for Linux

svn path=/nixpkgs/trunk/; revision=1547

pkgs/stdenv/nix-linux-static/curl-static/builder.sh

@@ -0,0 +1,5 @@
+. $stdenv/setup
+ 
+tar zxvf $src
+mkdir $out
+cp -a curl-7.12.0/* $out

pkgs/stdenv/nix-linux-static/curl-static/default.nix

@@ -0,0 +1,7 @@
+{stdenv}:
+ 
+stdenv.mkDerivation {
+  name = "curl-static-7.12.0";
+  builder = ./builder.sh;
+  src = ./curl-7.12.0-static.tar.gz;
+}