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/trivial-builders/test/write-text-file.nix

@@ -0,0 +1,34 @@
+{ writeTextFile }:
+let
+  veryWeirdName = ''here's a name with some "bad" characters, like spaces and quotes'';
+in writeTextFile {
+  name = "weird-names";
+  destination = "/etc/${veryWeirdName}";
+  text = ''passed!'';
+  checkPhase = ''
+    # intentionally hardcode everything here, to make sure
+    # Nix does not mess with file paths
+
+    name="here's a name with some \"bad\" characters, like spaces and quotes"
+    fullPath="$out/etc/$name"
+
+    if [ -f "$fullPath" ]; then
+      echo "[PASS] File exists!"
+    else
+      echo "[FAIL] File was not created at expected path!"
+      exit 1
+    fi
+
+    content=$(<"$fullPath")
+    expected="passed!"
+
+    if [ "$content" = "$expected" ]; then
+      echo "[PASS] Contents match!"
+    else
+      echo "[FAIL] File contents don't match!"
+      echo "       Expected: $expected"
+      echo "       Got:      $content"
+      exit 2
+    fi
+  '';
+}