Fix deprecated API and fix build

Change-Id: I111b3e68aa8b1896f8c9c3489e1c42c8c10bef68
diff --git a/benchmarks/spec_fixture.cc b/benchmarks/spec_fixture.cc
index 8c83edf..494ecef 100644
--- a/benchmarks/spec_fixture.cc
+++ b/benchmarks/spec_fixture.cc
@@ -169,8 +169,7 @@
   launchpad_load_from_file(lp, filename);
   launchpad_set_args(lp, argc, argv);
   launchpad_set_environ(lp, (const char**)environ);
-  launchpad_clone_mxio_root(lp);
-  launchpad_clone_mxio_cwd(lp);
+  launchpad_clone(lp, LP_CLONE_MXIO_ROOT | LP_CLONE_MXIO_CWD);
   launchpad_clone_fd(lp, STDIN_FILENO, STDIN_FILENO);
   launchpad_clone_fd(lp, STDOUT_FILENO, STDOUT_FILENO);
   launchpad_clone_fd(lp, STDERR_FILENO, STDERR_FILENO);