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/libgumath/default.nix

@@ -0,0 +1,34 @@
+{ lib, stdenv
+, fetchFromGitHub
+, libndtypes
+, libxnd
+}:
+
+stdenv.mkDerivation {
+  pname = "libgumath";
+  version = "unstable-2019-08-01";
+
+  src = fetchFromGitHub {
+    owner = "xnd-project";
+    repo = "gumath";
+    rev = "360ed454105ac5615a7cb7d216ad25bc4181b876";
+    sha256 = "1wprkxpmjrk369fpw8rbq51r7jvqkcndqs209y7p560cnagmsxc6";
+  };
+
+  buildInputs = [ libndtypes libxnd ];
+
+  # Override linker with cc (symlink to either gcc or clang)
+  # Library expects to use cc for linking
+  configureFlags = [
+    "LD=${stdenv.cc.targetPrefix}cc"
+  ];
+
+  doCheck = true;
+
+  meta = with lib; {
+    description = "Library supporting function dispatch on general data containers. C base and Python wrapper";
+    homepage = "https://xnd.io/";
+    license = licenses.bsd3;
+    maintainers = [ maintainers.costrouc ];
+  };
+}