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/nettle/generic.nix

@@ -0,0 +1,68 @@
+{ lib, stdenv, buildPackages, gmp, gnum4
+
+# Version specific args
+, version, src
+}:
+
+stdenv.mkDerivation {
+  pname = "nettle";
+
+  inherit version src;
+
+  outputs = [ "out" "dev" ];
+  outputBin = "dev";
+
+  depsBuildBuild = [ buildPackages.stdenv.cc ];
+  nativeBuildInputs = [ gnum4 ];
+  propagatedBuildInputs = [ gmp ];
+
+  configureFlags =
+    # runtime selection of HW-accelerated code; it's default since 3.7
+    [ "--enable-fat" ]
+    # Make sure the right <gmp.h> is found, and not the incompatible
+    # /usr/include/mp.h from OpenSolaris.  See
+    # <https://lists.gnu.org/archive/html/hydra-users/2012-08/msg00000.html>
+    # for details.
+    ++ lib.optional stdenv.isSunOS "--with-include-path=${gmp.dev}/include";
+
+  doCheck = (stdenv.hostPlatform.system != "i686-cygwin" && !stdenv.isDarwin);
+
+  enableParallelBuilding = true;
+
+  patches = lib.optional (stdenv.hostPlatform.system == "i686-cygwin")
+              ./cygwin.patch;
+
+  meta = with lib; {
+    description = "Cryptographic library";
+
+    longDescription = ''
+        Nettle is a cryptographic library that is designed to fit
+        easily in more or less any context: In crypto toolkits for
+        object-oriented languages (C++, Python, Pike, ...), in
+        applications like LSH or GNUPG, or even in kernel space.  In
+        most contexts, you need more than the basic cryptographic
+        algorithms, you also need some way to keep track of available
+        algorithms, their properties and variants.  You often have
+        some algorithm selection process, often dictated by a protocol
+        you want to implement.
+
+        And as the requirements of applications differ in subtle and
+        not so subtle ways, an API that fits one application well can
+        be a pain to use in a different context.  And that is why
+        there are so many different cryptographic libraries around.
+
+        Nettle tries to avoid this problem by doing one thing, the
+        low-level crypto stuff, and providing a simple but general
+        interface to it.  In particular, Nettle doesn't do algorithm
+        selection.  It doesn't do memory allocation. It doesn't do any
+        I/O.
+     '';
+
+     license = licenses.gpl2Plus;
+
+     homepage = "https://www.lysator.liu.se/~nisse/nettle/";
+
+     platforms = platforms.all;
+     maintainers = [ maintainers.vcunat ];
+  };
+}