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/os-specific/linux/kmod/aggregator.nix

@@ -0,0 +1,35 @@
+{ stdenvNoCC, kmod, modules, buildEnv, name ? "kernel-modules" }:
+
+buildEnv {
+  inherit name;
+
+  paths = modules;
+
+  postBuild =
+    ''
+      source ${stdenvNoCC}/setup
+
+      if ! test -d "$out/lib/modules"; then
+        echo "No modules found."
+        # To support a kernel without modules
+        exit 0
+      fi
+
+      kernelVersion=$(cd $out/lib/modules && ls -d *)
+      if test "$(echo $kernelVersion | wc -w)" != 1; then
+         echo "inconsistent kernel versions: $kernelVersion"
+         exit 1
+      fi
+
+      echo "kernel version is $kernelVersion"
+
+      shopt -s extglob
+
+      # Regenerate the depmod map files.  Be sure to pass an explicit
+      # kernel version number, otherwise depmod will use `uname -r'.
+      if test -w $out/lib/modules/$kernelVersion; then
+          rm -f $out/lib/modules/$kernelVersion/modules.!(builtin*|order*)
+          ${kmod}/bin/depmod -b $out -C $out/etc/depmod.d -a $kernelVersion
+      fi
+    '';
+}