lib: xpc: implement support for iterating through directories

lib/libfs/context.c

@@ -92,6 +92,7 @@ struct fs_context *fs_context_create(struct fs_allocator *alloc)
 	ctx->ctx_vtable.write = fs_msg_write;
 	ctx->ctx_vtable.seek = fs_msg_seek;
 	ctx->ctx_vtable.map = fs_msg_map;
+	ctx->ctx_vtable.getdents = fs_msg_getdents;
 
 	return ctx;
 }