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/science/math/zn_poly/default.nix

@@ -0,0 +1,64 @@
+{ stdenv
+, lib
+, fetchFromGitLab
+, fetchpatch
+, gmp
+, python3
+, tune ? false # tune to hardware, impure
+}:
+
+stdenv.mkDerivation rec {
+  version = "0.9.2";
+  pname = "zn_poly";
+
+  # sage has picked up the maintenance (bug fixes and building, not development)
+  # from the original, now unmaintained project which can be found at
+  # http://web.maths.unsw.edu.au/~davidharvey/code/zn_poly/
+  src = fetchFromGitLab {
+    owner = "sagemath";
+    repo = "zn_poly";
+    rev = version;
+    hash = "sha256-QBItcrrpOGj22/ShTDdfZjm63bGW2xY4c71R1q8abPE=";
+  };
+
+  buildInputs = [
+    gmp
+  ];
+
+  nativeBuildInputs = [
+    python3 # needed by ./configure to create the makefile
+  ];
+
+  # name of library file ("libzn_poly.so")
+  libbasename = "libzn_poly";
+  libext = stdenv.targetPlatform.extensions.sharedLibrary;
+
+  makeFlags = [ "CC=${stdenv.cc.targetPrefix}cc" ];
+
+  # Tuning (either autotuning or with hand-written paramters) is possible
+  # but not implemented here.
+  # It seems buggy anyways (see homepage).
+  buildFlags = [ "all" "${libbasename}${libext}" ];
+
+  configureFlags = lib.optionals (!tune) [
+    "--disable-tuning"
+  ];
+
+  # `make install` fails to install some header files and the lib file.
+  installPhase = ''
+    mkdir -p "$out/include/zn_poly"
+    mkdir -p "$out/lib"
+    cp "${libbasename}"*"${libext}" "$out/lib"
+    cp include/*.h "$out/include/zn_poly"
+  '';
+
+  doCheck = true;
+
+  meta = with lib; {
+    homepage = "https://web.maths.unsw.edu.au/~davidharvey/code/zn_poly/";
+    description = "Polynomial arithmetic over Z/nZ";
+    license = with licenses; [ gpl3 ];
+    maintainers = teams.sage.members;
+    platforms = platforms.unix;
+  };
+}