hotdoc: fix build with gcc15 (#446324)

pkgs/development/tools/hotdoc/default.nix

@@ -2,6 +2,7 @@
   lib,
   stdenv,
   buildPythonApplication,
+  fetchpatch,
   fetchPypi,
   replaceVars,
   clang,
@@ -45,6 +46,13 @@ buildPythonApplication rec {
       clang = lib.getExe clang;
       libclang = "${lib.getLib libclang}/lib/libclang${stdenv.hostPlatform.extensions.sharedLibrary}";
     })
+
+    # Fix build with gcc15
+    (fetchpatch {
+      name = "hotdoc-fix-c_comment_scanner-function-prototypes-gcc15.patch";
+      url = "https://github.com/hotdoc/hotdoc/commit/adf8518431fafb78c9b47862a0a9a58824b6a421.patch";
+      hash = "sha256-5y50Yk+AjV3aSk8H3k9od/Yvy09FyQQOcVOAcstQnw8=";
+    })
   ];
 
   build-system = [ setuptools ];