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/libraries/mtxclient/default.nix

@@ -0,0 +1,62 @@
+{ lib, stdenv
+, fetchFromGitHub
+, fetchpatch
+, cmake
+, pkg-config
+, openssl
+, olm
+, spdlog
+, nlohmann_json
+, coeurl
+, libevent
+, curl
+}:
+
+stdenv.mkDerivation rec {
+  pname = "mtxclient";
+  version = "0.7.0";
+
+  src = fetchFromGitHub {
+    owner = "Nheko-Reborn";
+    repo = "mtxclient";
+    rev = "v${version}";
+    sha256 = "sha256-iGw+qdw7heL5q7G0dwtl4PX2UA0Kka0FUmH610dM/00=";
+  };
+
+  postPatch = ''
+    # See https://github.com/gabime/spdlog/issues/1897
+    sed -i '1a add_compile_definitions(SPDLOG_FMT_EXTERNAL)' CMakeLists.txt
+  '';
+
+  cmakeFlags = [
+    # Network requiring tests can't be disabled individually:
+    # https://github.com/Nheko-Reborn/mtxclient/issues/22
+    "-DBUILD_LIB_TESTS=OFF"
+    "-DBUILD_LIB_EXAMPLES=OFF"
+  ];
+
+  nativeBuildInputs = [
+    cmake
+    pkg-config
+  ];
+  buildInputs = [
+    spdlog
+    nlohmann_json
+    openssl
+    olm
+    coeurl
+    libevent
+    curl
+  ];
+
+  meta = with lib; {
+    description = "Client API library for the Matrix protocol.";
+    homepage = "https://github.com/Nheko-Reborn/mtxclient";
+    license = licenses.mit;
+    maintainers = with maintainers; [ fpletz pstn ];
+    platforms = platforms.all;
+    # Should be fixable if a higher clang version is used, see:
+    # https://github.com/NixOS/nixpkgs/pull/85922#issuecomment-619287177
+    broken = stdenv.targetPlatform.isDarwin;
+  };
+}