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/mpir/default.nix

@@ -0,0 +1,25 @@
+{ lib, stdenv, fetchurl, m4, which, yasm }:
+
+stdenv.mkDerivation rec {
+  pname = "mpir";
+  version = "3.0.0";
+
+  nativeBuildInputs = [ m4 which yasm ];
+
+  src = fetchurl {
+    url = "https://mpir.org/mpir-${version}.tar.bz2";
+    sha256 = "1fvmhrqdjs925hzr2i8bszm50h00gwsh17p2kn2pi51zrxck9xjj";
+  };
+
+  configureFlags = [ "--enable-cxx" ]
+    ++ lib.optionals stdenv.isLinux [ "--enable-fat" ];
+
+  meta = {
+    description = "A highly optimised library for bignum arithmetic forked from GMP";
+    license = lib.licenses.lgpl3Plus;
+    maintainers = [lib.maintainers.raskin];
+    platforms = lib.platforms.unix;
+    downloadPage = "https://mpir.org/downloads.html";
+    homepage = "https://mpir.org/";
+  };
+}