Adding dropbear, a small implementation of ssh2 client and server.

I made it statically build by default

I had to fix the zlib static cross-build, because the native stripping corrupted the target
static library. It is not the first time I see this.

I add drobear to the cross-built packages for hydra.


svn path=/nixpkgs/trunk/; revision=20518

pkgs/development/libraries/zlib/default.nix

@@ -15,6 +15,10 @@ stdenv.mkDerivation {
     fi
   '';
 
+  crossAttrs = {
+    dontStrip = if static then true else false;
+  };
+
   # zlib doesn't like the automatic --disable-shared from the Cygwin stdenv.
   cygwinConfigureEnableShared = true;
 }