libcdio: fix build w/glibc-2.36

Failing Hydra build: https://hydra.nixos.org/build/193374680

pkgs/development/libraries/libcdio/default.nix

···
   };
 
   patches = [
+    # Fixes test failure of realpath test with glibc-2.36
+    (fetchpatch {
+      url = "https://src.fedoraproject.org/rpms/libcdio/raw/d49ccdd9c8b4e9d57c01539f4c8948f28ce82bca/f/realpath-test-fix.patch";
+      sha256 = "sha256-ldAGlcf79uQ8QAt4Au8Iv6jsI6ICZXtXOKZBpyELtN8=";
+    })
+
     # pull pending upstream patch to fix build on ncurses-6.3:
     #  https://savannah.gnu.org/patch/index.php?10130
     (fetchpatch {