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/text/mairix/default.nix

@@ -0,0 +1,26 @@
+{ lib, stdenv, fetchurl, zlib, bzip2, bison, flex }:
+
+stdenv.mkDerivation rec {
+  pname = "mairix";
+  version = "0.24";
+
+  src = fetchurl {
+    url = "mirror://sourceforge/mairix/mairix-${version}.tar.gz";
+    sha256 = "0msaxz5c5hf7k1ci16i67m4ynrbrpsxbqzk84nz6z2vnkh3jww50";
+  };
+
+  buildInputs = [ zlib bzip2 bison flex ];
+
+  # https://github.com/rc0/mairix/pull/19
+  patches = [ ./mmap.patch ];
+
+  enableParallelBuilding = true;
+
+  meta = {
+    homepage = "http://www.rc0.org.uk/mairix";
+    license = lib.licenses.gpl2Plus;
+    description = "Program for indexing and searching email messages stored in maildir, MH or mbox";
+    maintainers = with lib.maintainers; [viric];
+    platforms = with lib.platforms; all;
+  };
+}