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/tools/admin/adtool/default.nix

@@ -0,0 +1,46 @@
+{ lib, stdenv, fetchurl, openldap }:
+
+stdenv.mkDerivation rec {
+  pname = "adtool";
+  version = "1.3.3";
+
+  src = fetchurl {
+    url = "https://gp2x.org/adtool/${pname}-${version}.tar.gz";
+    sha256  = "1awmpjamrwivi69i0j2fyrziy9s096ckviqd9c4llc3990mfsn4n";
+  };
+
+  configureFlags = [
+    "--sysconfdir=/etc"
+  ];
+
+  installFlags = [
+    "sysconfdir=$(out)/etc"
+  ];
+
+  buildInputs = [ openldap ];
+
+  # Workaround build failure on -fno-common toolchains like upstream
+  # gcc-10. Otherwise build fails as:
+  #   ld: ../../src/lib/libactive_directory.a(active_directory.o):/build/adtool-1.3.3/src/lib/active_directory.h:31:
+  #     multiple definition of `system_config_file'; adtool.o:/build/adtool-1.3.3/src/tools/../../src/lib/active_directory.h:31: first defined here
+  NIX_CFLAGS_COMPILE = "-fcommon";
+
+  enableParallelBuilding = true;
+
+  postInstall = ''
+    mkdir -p $out/share/doc/adtool
+    mv $out/etc/* $out/share/doc/adtool
+    rmdir $out/etc
+  '';
+
+  # It requires an LDAP server for tests
+  doCheck = false;
+
+  meta = with lib; {
+    description = "Active Directory administration utility for Unix";
+    homepage = "https://gp2x.org/adtool";
+    license = licenses.gpl2;
+    maintainers = with maintainers; [ peterhoeg ];
+    broken = true; # does not link against recent libldap versions and unmaintained since 2017
+  };
+}