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/tools/misc/bc/default.nix

@@ -0,0 +1,40 @@
+{ lib, stdenv, autoreconfHook, buildPackages
+, fetchurl, flex, readline, ed, texinfo
+}:
+
+stdenv.mkDerivation rec {
+  pname = "bc";
+  version = "1.07.1";
+  src = fetchurl {
+    url = "mirror://gnu/bc/${pname}-${version}.tar.gz";
+    sha256 = "62adfca89b0a1c0164c2cdca59ca210c1d44c3ffc46daf9931cf4942664cb02a";
+  };
+
+  configureFlags = [ "--with-readline" ];
+
+  # As of 1.07 cross-compilation is quite complicated as the build system wants
+  # to build a code generator, bc/fbc, on the build machine.
+  patches = [ ./cross-bc.patch ];
+  depsBuildBuild = [ buildPackages.stdenv.cc ];
+  nativeBuildInputs = [
+    # Tools
+    autoreconfHook ed flex texinfo
+    # Libraries for build
+    buildPackages.readline buildPackages.ncurses
+  ];
+  buildInputs = [ readline flex ];
+
+  doCheck = true; # not cross
+
+  # Hack to make sure we never to the relaxation `$PATH` and hooks support for
+  # compatability. This will be replaced with something clearer in a future
+  # masss-rebuild.
+  strictDeps = true;
+
+  meta = with lib; {
+    description = "GNU software calculator";
+    homepage = "https://www.gnu.org/software/bc/";
+    license = licenses.gpl3Plus;
+    platforms = platforms.all;
+  };
+}