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/system/freeipmi/default.nix

@@ -0,0 +1,46 @@
+{ buildPackages, fetchurl, lib, stdenv, libgcrypt, readline, libgpg-error }:
+
+stdenv.mkDerivation rec {
+  version = "1.6.9";
+  pname = "freeipmi";
+
+  src = fetchurl {
+    url = "mirror://gnu/freeipmi/${pname}-${version}.tar.gz";
+    sha256 = "sha256-8l4cNfPQ8bWpnMMezCNTyoPtRqFRY4QvuocBJ9ycggY=";
+  };
+
+  depsBuildBuild = [ buildPackages.stdenv.cc ];
+
+  buildInputs = [ libgcrypt readline libgpg-error ];
+
+  configureFlags = lib.optionals (stdenv.buildPlatform != stdenv.hostPlatform)
+    [ "ac_cv_file__dev_urandom=true" "ac_cv_file__dev_random=true" ];
+
+  doCheck = true;
+
+  meta = {
+    description = "Implementation of the Intelligent Platform Management Interface";
+
+    longDescription =
+      '' GNU FreeIPMI provides in-band and out-of-band IPMI software based on
+         the IPMI v1.5/2.0 specification.  The IPMI specification defines a
+         set of interfaces for platform management and is implemented by a
+         number vendors for system management.  The features of IPMI that
+         most users will be interested in are sensor monitoring, system event
+         monitoring, power control, and serial-over-LAN (SOL).  The FreeIPMI
+         tools and libraries listed below should provide users with the
+         ability to access and utilize these and many other features.  A
+         number of useful features for large HPC or cluster environments have
+         also been implemented into FreeIPMI. See the README or FAQ for more
+         info.
+      '';
+
+    homepage = "https://www.gnu.org/software/freeipmi/";
+    downloadPage = "https://www.gnu.org/software/freeipmi/download.html";
+
+    license = lib.licenses.gpl3Plus;
+
+    maintainers = with lib.maintainers; [ raskin ];
+    platforms = lib.platforms.gnu ++ lib.platforms.linux;  # arbitrary choice
+  };
+}