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/servers/mlflow-server/default.nix

@@ -0,0 +1,37 @@
+{lib, python3, writeText}:
+
+let
+  py = python3.pkgs;
+in
+py.toPythonApplication
+  (py.mlflow.overridePythonAttrs(old: rec {
+    pname = "mlflow-server";
+
+    propagatedBuildInputs = old.propagatedBuildInputs ++ [
+      py.boto3
+      py.mysqlclient
+    ];
+
+    postPatch = ''
+      substituteInPlace mlflow/utils/process.py --replace \
+        "child = subprocess.Popen(cmd, env=cmd_env, cwd=cwd, universal_newlines=True," \
+        "cmd[0]='$out/bin/gunicornMlflow'; child = subprocess.Popen(cmd, env=cmd_env, cwd=cwd, universal_newlines=True,"
+    '';
+
+    gunicornScript = writeText "gunicornMlflow"
+    ''
+        #!/usr/bin/env python
+        import re
+        import sys
+        from gunicorn.app.wsgiapp import run
+        if __name__ == '__main__':
+          sys.argv[0] = re.sub(r'(-script\.pyw|\.exe)?$', ''', sys.argv[0])
+          sys.exit(run())
+      '';
+
+    postInstall = ''
+      gpath=$out/bin/gunicornMlflow
+      cp ${gunicornScript} $gpath
+      chmod 555 $gpath
+    '';
+}))