allow embeddings models to use mmap

expose.h

@@ -256,6 +256,7 @@ struct embeddings_load_model_inputs
     const char * vulkan_info = nullptr;
     const int gpulayers = 0;
     const bool flash_attention = false;
+    const bool use_mmap = false;
     const bool quiet = false;
     const int debugmode = 0;
 };