vvenc: Fix build on Darwin

pkgs/by-name/vv/vvenc/package.nix

···
     hash = "sha256-9fWKunafTniBsY9hK09+xYwvB7IgGPhZmgqauPHgB/g=";
   };
 
+  patches = [ ./unset-darwin-cmake-flags.patch ];
+
   env.NIX_CFLAGS_COMPILE = toString (
     lib.optionals stdenv.cc.isGNU [
       "-Wno-maybe-uninitialized"

pkgs/by-name/vv/vvenc/unset-darwin-cmake-flags.patch

···
+--- a/source/Lib/vvenc/CMakeLists.txt	2025-01-14 23:26:14
++++ b/source/Lib/vvenc/CMakeLists.txt	2025-01-14 23:26:43
+@@ -174,6 +174,4 @@
+ set_target_properties( ${LIB_NAME} PROPERTIES
+                                    VERSION ${PROJECT_VERSION}
+                                    SOVERSION ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
+-                                   INSTALL_NAME_DIR ${CMAKE_INSTALL_PREFIX}/lib
+-                                   MACOSX_RPATH FALSE
+                                    FOLDER lib )