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/eclib/default.nix

@@ -0,0 +1,52 @@
+{ lib, stdenv
+, fetchurl
+, autoreconfHook
+, pari
+, ntl
+, gmp
+# "FLINT is optional and only used for one part of sparse matrix reduction,
+# which is used in the modular symbol code but not mwrank or other elliptic
+# curve programs." -- https://github.com/JohnCremona/eclib/blob/master/README
+, withFlint ? false, flint ? null
+}:
+
+assert withFlint -> flint != null;
+
+stdenv.mkDerivation rec {
+  pname = "eclib";
+  version = "20210625"; # upgrade might break the sage interface
+  # sage tests to run:
+  # src/sage/interfaces/mwrank.py
+  # src/sage/libs/eclib
+  # ping @timokau for more info
+  src = fetchurl {
+    # all releases for this project appear on its GitHub releases page
+    # by definition! other distros sometimes update whenever they see
+    # a version bump in configure.ac or a new tag (and this might show
+    # up on repology). however, a version bump or a new tag may not
+    # represent a new release, and a new release might not be tagged.
+    #
+    # see https://github.com/JohnCremona/eclib/issues/64#issuecomment-789788561
+    # for upstream's explanation of the above
+    url = "https://github.com/JohnCremona/eclib/releases/download/${version}/eclib-${version}.tar.bz2";
+    sha256 = "sha256-fA3MPz/L+Q39sA8wxAYOUowlHRcgOd8VF4tpsBGI6BA=";
+  };
+  buildInputs = [
+    pari
+    ntl
+    gmp
+  ] ++ lib.optionals withFlint [
+    flint
+  ];
+  nativeBuildInputs = [
+    autoreconfHook
+  ];
+  doCheck = true;
+  meta = with lib; {
+    description = "Elliptic curve tools";
+    homepage = "https://github.com/JohnCremona/eclib";
+    license = licenses.gpl2Plus;
+    maintainers = teams.sage.members;
+    platforms = platforms.all;
+  };
+}