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/build-support/fake-nss/default.nix

@@ -0,0 +1,24 @@
+# Provide a /etc/passwd and /etc/group that contain root and nobody.
+# Useful when packaging binaries that insist on using nss to look up
+# username/groups (like nginx).
+# /bin/sh is fine to not exist, and provided by another shim.
+{ symlinkJoin, writeTextDir, runCommand }:
+symlinkJoin {
+  name = "fake-nss";
+  paths = [
+    (writeTextDir "etc/passwd" ''
+      root:x:0:0:root user:/var/empty:/bin/sh
+      nobody:x:65534:65534:nobody:/var/empty:/bin/sh
+    '')
+    (writeTextDir "etc/group" ''
+      root:x:0:
+      nobody:x:65534:
+    '')
+    (writeTextDir "etc/nsswitch.conf" ''
+      hosts: files dns
+    '')
+    (runCommand "var-empty" { } ''
+      mkdir -p $out/var/empty
+    '')
+  ];
+}