uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/development/libraries/libssh/default.nix

@@ -0,0 +1,31 @@
+{ lib, stdenv, fetchurl, pkg-config, cmake, zlib, openssl, libsodium }:
+
+stdenv.mkDerivation rec {
+  pname = "libssh";
+  version = "0.9.6";
+
+  src = fetchurl {
+    url = "https://www.libssh.org/files/${lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
+    sha256 = "sha256-hrz4hb2bgEZv4OBUU8WLh332GvqLqUeljDVtfw+rgps=";
+  };
+
+  postPatch = ''
+    # Fix headers to use libsodium instead of NaCl
+    sed -i 's,nacl/,sodium/,g' ./include/libssh/curve25519.h src/curve25519.c
+  '';
+
+  # single output, otherwise cmake and .pc files point to the wrong directory
+  # outputs = [ "out" "dev" ];
+
+  buildInputs = [ zlib openssl libsodium ];
+
+  nativeBuildInputs = [ cmake pkg-config ];
+
+  meta = with lib; {
+    description = "SSH client library";
+    homepage = "https://libssh.org";
+    license = licenses.lgpl2Plus;
+    maintainers = with maintainers; [ sander ];
+    platforms = platforms.all;
+  };
+}