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/os-specific/linux/target-isns/default.nix

@@ -0,0 +1,36 @@
+{ lib, stdenv, cmake, fetchFromGitHub, fetchpatch } :
+
+stdenv.mkDerivation rec {
+  pname = "target-isns";
+  version = "0.6.8";
+
+  src = fetchFromGitHub {
+    owner = "open-iscsi";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "1b6jjalvvkkjyjbg1pcgk8vmvc6xzzksyjnh2pfi45bbpya4zxim";
+  };
+
+  patches = [
+    # fix absoulute paths
+    ./install_prefix_path.patch
+
+    # fix gcc 10 compiler warning, remove with next update
+    (fetchpatch {
+      url = "https://github.com/open-iscsi/target-isns/commit/3d0c47dd89bcf83d828bcc22ecaaa5f58d78b58e.patch";
+      sha256 = "1x2bkc1ff15621svhpq1r11m0q4ajv0j4fng6hm7wkkbr2s6d1vx";
+    })
+  ];
+
+  cmakeFlags = [ "-DSUPPORT_SYSTEMD=ON" ];
+
+  nativeBuildInputs = [ cmake ];
+
+  meta = with lib; {
+    description = "iSNS client for the Linux LIO iSCSI target";
+    homepage = "https://github.com/open-iscsi/target-isns";
+    maintainers = [ maintainers.markuskowa ];
+    license = licenses.gpl2Only;
+    platforms = platforms.linux;
+  };
+}