nix: boost 1.81 C++17 detection seems to be broken on Clang 16

std::{unary,binary}_function is removed in C++17, but boost still
tries to use it:

  vectorscan> In file included from include/boost/multi_array/multi_array_ref.hpp:32:
  868
  vectorscan> include/boost/functional.hpp:45:24: error: no member named 'unary_function' in namespace 'std'; did you mean '__unary_function'?
  869
  vectorscan>             using std::unary_function;
  870
  vectorscan>                   ~~~~~^

flake.nix

@@ -44,7 +44,7 @@
           python3
         ] ++ lib.optional stdenv.isDarwin libiconv
         ++ lib.optional (system == "x86_64-linux") hyperscan
-        ++ lib.optional (system != "x86_64-linux") vectorscan;
+        ++ lib.optional (system != "x86_64-linux") (vectorscan.override { boost = boost183; });
 
         rust-toolchain = fenix.packages.${system}.complete.toolchain;
         rust-toolchain-llvm-tools = fenix.packages.${system}.complete.withComponents [
@@ -147,7 +147,7 @@
                     ] ++ lib.optional stdenv.isDarwin libiconv
                     ++ lib.optional vendor boost
                     ++ lib.optional (!vendor && system == "x86_64-linux") hyperscan
-                    ++ lib.optional (!vendor && system != "x86_64-linux") vectorscan;
+                    ++ lib.optional (!vendor && system != "x86_64-linux") (vectorscan.override { boost = boost183; });
 
                     nativeBuildInputs = mkNativeBuildInputs {
                       inherit rustPlatform;