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/applications/networking/gns3/server.nix

@@ -0,0 +1,100 @@
+{ stable
+, branch
+, version
+, sha256Hash
+, mkOverride
+, commonOverrides
+}:
+
+{ lib
+, python3
+, fetchFromGitHub
+, packageOverrides ? self: super: {}
+}:
+
+let
+  defaultOverrides = commonOverrides ++ [
+    (self: super: {
+      jsonschema = super.jsonschema.overridePythonAttrs (oldAttrs: rec {
+        version = "3.2.0";
+
+        src = super.fetchPypi {
+          inherit (oldAttrs) pname;
+          inherit version;
+          sha256 = "sha256-yKhbKNN3zHc35G4tnytPRO48Dh3qxr9G3e/HGH0weXo=";
+        };
+
+        SETUPTOOLS_SCM_PRETEND_VERSION = version;
+
+        doCheck = false;
+      });
+
+    })
+  ];
+
+  python = python3.override {
+    packageOverrides = lib.foldr lib.composeExtensions (self: super: { }) ([ packageOverrides ] ++ defaultOverrides);
+  };
+in python.pkgs.buildPythonApplication {
+  pname = "gns3-server";
+  inherit version;
+
+  src = fetchFromGitHub {
+    owner = "GNS3";
+    repo = "gns3-server";
+    rev = "v${version}";
+    sha256 = sha256Hash;
+  };
+
+  postPatch = ''
+    substituteInPlace requirements.txt \
+      --replace "aiohttp==" "aiohttp>=" \
+      --replace "aiofiles==" "aiofiles>=" \
+      --replace "Jinja2==" "Jinja2>=" \
+      --replace "sentry-sdk==" "sentry-sdk>=" \
+      --replace "async-timeout==" "async-timeout>=" \
+      --replace "psutil==" "psutil>=" \
+      --replace "distro==" "distro>=" \
+      --replace "py-cpuinfo==" "py-cpuinfo>=" \
+      --replace "setuptools==" "setuptools>="
+  '';
+
+  propagatedBuildInputs = with python.pkgs; [
+    aiofiles
+    aiohttp
+    aiohttp-cors
+    async_generator
+    distro
+    jinja2
+    jsonschema
+    multidict
+    prompt-toolkit
+    psutil
+    py-cpuinfo
+    sentry-sdk
+    setuptools
+    yarl
+    zipstream
+  ];
+
+  # Requires network access
+  doCheck = false;
+
+  postInstall = ''
+    rm $out/bin/gns3loopback # For Windows only
+  '';
+
+  meta = with lib; {
+    description = "Graphical Network Simulator 3 server (${branch} release)";
+    longDescription = ''
+      The GNS3 server manages emulators such as Dynamips, VirtualBox or
+      Qemu/KVM. Clients like the GNS3 GUI control the server using a HTTP REST
+      API.
+    '';
+    homepage = "https://www.gns3.com/";
+    changelog = "https://github.com/GNS3/gns3-server/releases/tag/v${version}";
+    license = licenses.gpl3Plus;
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ ];
+  };
+}