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/syscall_limiter/default.nix

@@ -0,0 +1,37 @@
+{ lib, stdenv
+, fetchFromGitHub
+, libseccomp
+, perl
+, which
+}:
+
+stdenv.mkDerivation {
+  pname = "syscall_limiter";
+  version = "2017-01-23";
+
+  src = fetchFromGitHub {
+    owner  = "vi";
+    repo   = "syscall_limiter";
+    rev    = "481c8c883f2e1260ebc83b352b63bf61a930a341";
+    sha256 = "0z5arj1kq1xczgrbw1b8m9kicbv3vs9bd32wvgfr4r6ndingsp5m";
+  };
+
+  buildInputs = [ libseccomp ];
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp -v limit_syscalls $out/bin
+    cp -v monitor.sh $out/bin/limit_syscalls_monitor.sh
+    substituteInPlace $out/bin/limit_syscalls_monitor.sh \
+      --replace perl ${perl}/bin/perl \
+      --replace which ${which}/bin/which
+  '';
+
+  meta = with lib; {
+    description = "Start Linux programs with only selected syscalls enabled";
+    homepage    = "https://github.com/vi/syscall_limiter";
+    license     = licenses.mit;
+    maintainers = with maintainers; [ obadz ];
+    platforms   = platforms.linux;
+  };
+}