cpplint: fix build on Python 3.14

Backport upstream’s removal of deprecated codecs.open(), whose warnings cause the test suite to fail under Python 3.14.

https://github.com/cpplint/cpplint/pull/405

Assisted-by: pi coding agent / Mika (OpenAI gpt-5.6-sol)

pkgs/by-name/cp/cpplint/package.nix

@@ -2,6 +2,7 @@
   lib,
   python3Packages,
   fetchFromGitHub,
+  fetchpatch2,
   versionCheckHook,
 }:
 
@@ -17,6 +18,20 @@ python3Packages.buildPythonApplication (finalAttrs: {
     hash = "sha256-4crTuqynQt8Nyjqea6DpREtLy7ydRF0hNVnc7tUnO1k=";
   };
 
+  # Fix Python 3.14 test failures. Remove with the next release.
+  patches = [
+    (fetchpatch2 {
+      name = "drop-codecs-open.patch";
+      url = "https://github.com/cpplint/cpplint/commit/89bff410afed72e58d23ae084de4103986ea8630.patch?full_index=1";
+      hash = "sha256-Jdeewj3GM7GMoRF7+Qz/9n1hc8PYPcXLgtSGwSUpT1E=";
+    })
+    (fetchpatch2 {
+      name = "use-universal-newlines.patch";
+      url = "https://github.com/cpplint/cpplint/commit/d15a8715a6e848f784fda700758c4ac2d252fd31.patch?full_index=1";
+      hash = "sha256-Oo2doknEGnuxDJA0y17n1DCaKwadtMW/14a5wnIgfkw=";
+    })
+  ];
+
   # We use pytest-cov-stub instead
   postPatch = ''
     substituteInPlace pyproject.toml \