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>

nixos/tests/brscan5.nix

@@ -0,0 +1,43 @@
+# integration tests for brscan5 sane driver
+#
+
+import ./make-test-python.nix ({ pkgs, ...} : {
+  name = "brscan5";
+  meta = with pkgs.lib.maintainers; {
+    maintainers = [ mattchrist ];
+  };
+
+  nodes.machine = { pkgs, ... }:
+    {
+      nixpkgs.config.allowUnfree = true;
+      hardware.sane = {
+        enable = true;
+        brscan5 = {
+          enable = true;
+          netDevices = {
+            "a" = { model="ADS-1200"; nodename="BRW0080927AFBCE"; };
+            "b" = { model="ADS-1200"; ip="192.168.1.2"; };
+          };
+        };
+      };
+    };
+
+  testScript = ''
+    import re
+    # sane loads libsane-brother5.so.1 successfully, and scanimage doesn't die
+    strace = machine.succeed('strace scanimage -L 2>&1').split("\n")
+    regexp = 'openat\(.*libsane-brother5.so.1", O_RDONLY|O_CLOEXEC\) = \d\d*$'
+    assert len([x for x in strace if re.match(regexp,x)]) > 0
+
+    # module creates a config
+    cfg = machine.succeed('cat /etc/opt/brother/scanner/brscan5/brsanenetdevice.cfg')
+    assert 'DEVICE=a , "ADS-1200" , 0x4f9:0x459 , NODENAME=BRW0080927AFBCE' in cfg
+    assert 'DEVICE=b , "ADS-1200" , 0x4f9:0x459 , IP-ADDRESS=192.168.1.2' in cfg
+
+    # scanimage lists the two network scanners
+    scanimage = machine.succeed("scanimage -L")
+    print(scanimage)
+    assert """device `brother5:net1;dev0' is a Brother b ADS-1200""" in scanimage
+    assert """device `brother5:net1;dev1' is a Brother a ADS-1200""" in scanimage
+  '';
+})