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/tools/swiftformat/default.nix

@@ -0,0 +1,45 @@
+{ stdenv, lib, fetchFromGitHub, runCommand }:
+
+# This derivation is impure: it relies on an Xcode toolchain being installed
+# and available in the expected place. The values of sandboxProfile and
+# hydraPlatforms are copied pretty directly from the MacVim derivation, which
+# is also impure.
+
+stdenv.mkDerivation rec {
+  pname = "swiftformat";
+  version = "0.47.10";
+
+  src = fetchFromGitHub {
+    owner = "nicklockwood";
+    repo = "SwiftFormat";
+    rev = version;
+    sha256 = "1gqxpymbhpmap0i2blg9akarlql4mkzv45l4i212gsxcs991b939";
+  };
+
+  preConfigure = "LD=$CC";
+
+  buildPhase = ''
+    /usr/bin/xcodebuild -project SwiftFormat.xcodeproj \
+      -scheme "SwiftFormat (Command Line Tool)" \
+      CODE_SIGN_IDENTITY= SYMROOT=build OBJROOT=build
+  '';
+
+  installPhase = ''
+    install -D -m 0555 build/Release/swiftformat $out/bin/swiftformat
+  '';
+
+  sandboxProfile = ''
+    (allow file-read* file-write* process-exec mach-lookup)
+    ; block homebrew dependencies
+    (deny file-read* file-write* process-exec mach-lookup (subpath "/usr/local") (with no-log))
+  '';
+
+  meta = with lib; {
+    description = "A code formatting and linting tool for Swift";
+    homepage = "https://github.com/nicklockwood/SwiftFormat";
+    license = licenses.mit;
+    maintainers = [ maintainers.bdesham ];
+    platforms = platforms.darwin;
+    hydraPlatforms = [];
+  };
+}