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/applications/misc/elfx86exts/default.nix

@@ -0,0 +1,30 @@
+{ lib
+, rustPlatform
+, fetchFromGitHub
+}:
+
+rustPlatform.buildRustPackage rec {
+  pname = "elfx86exts";
+  version = "0.4.3";
+
+  src = fetchFromGitHub {
+    owner = "pkgw";
+    repo = pname;
+    rev = "${pname}@${version}";
+    sha256 = "1j9ca2lyxjsrf0rsfv83xi53vj6jz5nb76xibh367brcsc26mvd6";
+  };
+
+  cargoSha256 = "0n3b9vdk5n32jmd7ks50d55z4dfahjincd2s1d8m9z17ip2qw2c4";
+
+  meta = with lib; {
+    description = "Decode x86 binaries and print out which instruction set extensions they use.";
+    longDescription = ''
+      Disassemble a binary containing x86 instructions and print out which extensions it uses.
+      Despite the utterly misleading name, this tool supports ELF and MachO binaries, and
+      perhaps PE-format ones as well. (It used to be more limited.)
+    '';
+    homepage = "https://github.com/pkgw/elfx86exts";
+    maintainers = with maintainers; [ rmcgibbo ];
+    license = with licenses; [ mit ];
+  };
+}