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/test/patch-shebangs/default.nix

@@ -0,0 +1,70 @@
+{ lib, stdenv, runCommand }:
+
+let
+  tests = {
+    bad-shebang = stdenv.mkDerivation {
+      name         = "bad-shebang";
+      dontUnpack = true;
+      installPhase = ''
+        mkdir -p $out/bin
+        echo "#!/bin/sh" > $out/bin/test
+        echo "echo -n hello" >> $out/bin/test
+        chmod +x $out/bin/test
+      '';
+      passthru = {
+        assertion = "grep -v '^#!/bin/sh' $out/bin/test > /dev/null";
+      };
+    };
+
+    ignores-nix-store = stdenv.mkDerivation {
+      name = "ignores-nix-store";
+      dontUnpack = true;
+      installPhase = ''
+        mkdir -p $out/bin
+        echo "#!$NIX_STORE/path/to/sh" > $out/bin/test
+        echo "echo -n hello" >> $out/bin/test
+        chmod +x $out/bin/test
+      '';
+      passthru = {
+        assertion = "grep \"^#!$NIX_STORE/path/to/sh\" $out/bin/test > /dev/null";
+      };
+    };
+  };
+in runCommand "patch-shebangs-test" {
+  passthru = { inherit (tests) bad-shebang ignores-nix-store; };
+  meta.platforms = lib.platforms.all;
+} ''
+  validate() {
+    local name=$1
+    local testout=$2
+    local assertion=$3
+
+    echo -n "... $name: " >&2
+
+    local rc=0
+    (out=$testout eval "$assertion") || rc=1
+
+    if [ "$rc" -eq 0 ]; then
+      echo "yes" >&2
+    else
+      echo "no" >&2
+    fi
+
+    return "$rc"
+  }
+
+  echo "checking whether patchShebangs works properly... ">&2
+
+  fail=
+  ${lib.concatStringsSep "\n" (lib.mapAttrsToList (_: test: ''
+    validate "${test.name}" "${test}" ${lib.escapeShellArg test.assertion} || fail=1
+  '') tests)}
+
+  if [ "$fail" ]; then
+    echo "failed"
+    exit 1
+  else
+    echo "succeeded"
+    touch $out
+  fi
+''