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/package-management/pacman/default.nix

@@ -0,0 +1,41 @@
+{ stdenv, lib, fetchurl, pkg-config, m4, perl, libarchive, openssl, zlib, bzip2,
+xz, curl, runtimeShell }:
+
+stdenv.mkDerivation rec {
+  pname = "pacman";
+  version = "5.2.2";
+
+  src = fetchurl {
+    url = "https://sources.archlinux.org/other/${pname}/${pname}-${version}.tar.gz";
+    sha256 = "1829jcc300fxidr3cahx5kpnxkpg500daqgn2782hg5m5ygil85v";
+  };
+
+  enableParallelBuilding = true;
+
+  configureFlags = [
+    # trying to build docs fails with a2x errors, unable to fix through asciidoc
+    "--disable-doc"
+
+    "--sysconfdir=/etc"
+    "--localstatedir=/var"
+    "--with-scriptlet-shell=${runtimeShell}"
+  ];
+
+  installFlags = [ "sysconfdir=${placeholder "out"}/etc" ];
+
+  nativeBuildInputs = [ pkg-config m4 ];
+  buildInputs = [ curl perl libarchive openssl zlib bzip2 xz ];
+
+  postFixup = ''
+    substituteInPlace $out/bin/repo-add \
+      --replace bsdtar "${libarchive}/bin/bsdtar"
+  '';
+
+  meta = with lib; {
+    description = "A simple library-based package manager";
+    homepage = "https://www.archlinux.org/pacman/";
+    license = licenses.gpl2;
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ mt-caret ];
+  };
+}