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/spandsp/default.nix

@@ -0,0 +1,33 @@
+{ lib, stdenv, fetchurl, audiofile, libtiff, buildPackages }:
+stdenv.mkDerivation rec {
+  version = "0.0.6";
+  pname = "spandsp";
+  src=fetchurl {
+    url = "https://www.soft-switch.org/downloads/spandsp/spandsp-${version}.tar.gz";
+    sha256 = "0rclrkyspzk575v8fslzjpgp4y2s4x7xk3r55ycvpi4agv33l1fc";
+  };
+
+  outputs = [ "out" "dev" ];
+  makeFlags = [
+    "CC=${stdenv.cc.targetPrefix}cc"
+  ];
+
+  configureFlags = [
+    # This flag is required to prevent linking error in the cross-compilation case.
+    # I think it's fair to assume that realloc(NULL, size) will return a valid memory
+    # block for most libc implementation, so let's just assume that and hope for the best.
+    "ac_cv_func_malloc_0_nonnull=yes"
+  ];
+
+  strictDeps = true;
+  depsBuildBuild = [ buildPackages.stdenv.cc ];
+  propagatedBuildInputs = [audiofile libtiff];
+  meta = {
+    description = "A portable and modular SIP User-Agent with audio and video support";
+    homepage = "http://www.creytiv.com/baresip.html";
+    platforms = with lib.platforms; linux;
+    maintainers = with lib.maintainers; [raskin];
+    license = lib.licenses.gpl2;
+    downloadPage = "http://www.soft-switch.org/downloads/spandsp/";
+  };
+}