Fix: Disable zlib in dpcpp to avoid linking to system library

Matching build options for regular LLVM.

Pull Request: https://projects.blender.org/blender/blender/pulls/134244

build_files/build_environment/cmake/dpcpp.cmake

@@ -82,6 +82,7 @@ set(DPCPP_EXTRA_ARGS
   -DPYTHON_EXECUTABLE=${PYTHON_BINARY}
   -DLLDB_ENABLE_CURSES=OFF
   -DLLVM_ENABLE_TERMINFO=OFF
+  -DLLVM_ENABLE_ZLIB=OFF
   -DLLVM_ENABLE_ZSTD=FORCE_ON
   -DLLVM_USE_STATIC_ZSTD=ON
   -Dzstd_INCLUDE_DIR=${LIBDIR}/zstd/include