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/mail/opensmtpd/default.nix

@@ -0,0 +1,68 @@
+{ lib, stdenv, fetchurl, autoconf, automake, libtool, bison
+, libasr, libevent, zlib, libressl, db, pam, nixosTests
+}:
+
+stdenv.mkDerivation rec {
+  pname = "opensmtpd";
+  version = "6.8.0p2";
+
+  nativeBuildInputs = [ autoconf automake libtool bison ];
+  buildInputs = [ libasr libevent zlib libressl db pam ];
+
+  src = fetchurl {
+    url = "https://www.opensmtpd.org/archives/${pname}-${version}.tar.gz";
+    sha256 = "05sd7bmq29ibnqbl2z53hiyprfxzf0qydfdaixs68rz55wqhbgsi";
+  };
+
+  patches = [
+    ./proc_path.diff # TODO: upstream to OpenSMTPD, see https://github.com/NixOS/nixpkgs/issues/54045
+    ./cross_fix.diff # TODO: remove when https://github.com/OpenSMTPD/OpenSMTPD/pull/1177 will have made it into a release
+  ];
+
+  # See https://github.com/OpenSMTPD/OpenSMTPD/issues/885 for the `sh bootstrap`
+  # requirement
+  postPatch = ''
+    substituteInPlace mk/smtpctl/Makefile.am --replace "chgrp" "true"
+    substituteInPlace mk/smtpctl/Makefile.am --replace "chmod 2555" "chmod 0555"
+    sh bootstrap
+  '';
+
+  configureFlags = [
+    "--sysconfdir=/etc"
+    "--localstatedir=/var"
+    "--with-mantype=doc"
+    "--with-auth-pam"
+    "--without-auth-bsdauth"
+    "--with-path-socket=/run"
+    "--with-path-pidfile=/run"
+    "--with-user-smtpd=smtpd"
+    "--with-user-queue=smtpq"
+    "--with-group-queue=smtpq"
+    "--with-path-CAfile=/etc/ssl/certs/ca-certificates.crt"
+    "--with-libevent=${libevent.dev}"
+    "--with-table-db"
+  ];
+
+  # See https://github.com/OpenSMTPD/OpenSMTPD/pull/884
+  makeFlags = [ "CFLAGS=-ffunction-sections" "LDFLAGS=-Wl,--gc-sections" ];
+
+  installFlags = [
+    "sysconfdir=\${out}/etc"
+    "localstatedir=\${TMPDIR}"
+  ];
+
+  meta = with lib; {
+    homepage = "https://www.opensmtpd.org/";
+    description = ''
+      A free implementation of the server-side SMTP protocol as defined by
+      RFC 5321, with some additional standard extensions
+    '';
+    license = licenses.isc;
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ obadz ekleog ];
+  };
+  passthru.tests = {
+    basic-functionality-and-dovecot-interaction = nixosTests.opensmtpd;
+    rspamd-integration = nixosTests.opensmtpd-rspamd;
+  };
+}