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/tools/system/ioping/default.nix

@@ -0,0 +1,31 @@
+{ lib, stdenv, fetchFromGitHub, fetchpatch }:
+
+stdenv.mkDerivation rec {
+  pname = "ioping";
+  version = "1.2";
+
+  src = fetchFromGitHub {
+    owner = "koct9i";
+    repo = "ioping";
+    rev = "v${version}";
+    sha256 = "10bv36bqga8sdifxzywzzpjil7vmy62psirz7jbvlsq1bw71aiid";
+  };
+
+  patches = [
+    # add netdata support: https://github.com/koct9i/ioping/pull/41
+    (fetchpatch {
+      url = "https://github.com/koct9i/ioping/commit/e7b818457ddb952cbcc13ae732ba0328f6eb73b3.patch";
+      sha256 = "122ivp4rqsnjszjfn33z8li6glcjhy7689bgipi8cgs5q55j99gf";
+    })
+  ];
+
+  makeFlags = [ "PREFIX=$(out)" ];
+
+  meta = with lib; {
+    description = "Disk I/O latency measuring tool";
+    maintainers = with maintainers; [ raskin ];
+    platforms = platforms.unix;
+    license = licenses.gpl3Plus;
+    homepage = "https://github.com/koct9i/ioping";
+  };
+}