kdePackages.libktorrent: fix build with Qt 6.9

pkgs/kde/gear/libktorrent/default.nix

···
   boost,
   gmp,
   libgcrypt,
+  fetchpatch,
 }:
 mkKdeDerivation {
   pname = "libktorrent";
+
+  # Backport patches to fix build with Qt 6.9
+  # FIXME: remove in 25.04
+  patches = [
+    (fetchpatch {
+      url = "https://invent.kde.org/network/libktorrent/-/commit/4bcf7eb1e0cb781286eae33751acd8e827080ec5.patch";
+      includes = [ "src/utp/connection.cpp" ];
+      hash = "sha256-gj5jLViuzttfzCrx/izmajJiH3vE9TkfsXS+1r/qGNc=";
+    })
+    (fetchpatch {
+      url = "https://invent.kde.org/network/libktorrent/-/commit/4f73038c74b5d72b2f7f1377c7bf037f111e965d.patch";
+      hash = "sha256-dQeZLmnagxBOUR2hnxF65jIRSAntTrEggxdUf3NNzDE=";
+    })
+  ];
 
   extraNativeBuildInputs = [ doxygen ];
   extraBuildInputs = [ qt5compat ];