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/libb2/default.nix

@@ -0,0 +1,32 @@
+{ lib, stdenv, fetchFromGitHub, autoconf, automake, libtool, pkg-config }:
+
+stdenv.mkDerivation rec {
+  pname = "libb2";
+  version = "0.98.1";
+
+  src = fetchFromGitHub {
+    owner = "BLAKE2";
+    repo = "libb2";
+    rev = "v${version}";
+    sha256 = "0qj8aaqvfcavj1vj5asm4pqm03ap7q8x4c2fy83cqggvky0frgya";
+  };
+
+  preConfigure = ''
+    patchShebangs autogen.sh
+    ./autogen.sh
+  '';
+
+  configureFlags = lib.optional stdenv.hostPlatform.isx86 "--enable-fat=yes";
+
+  nativeBuildInputs = [ autoconf automake libtool pkg-config ];
+
+  doCheck = true;
+
+  meta = with lib; {
+    description = "The BLAKE2 family of cryptographic hash functions";
+    homepage = "https://blake2.net/";
+    platforms = platforms.all;
+    maintainers = with maintainers; [ dfoxfranke dotlambda ];
+    license = licenses.cc0;
+  };
+}