[fusl] Build example apptests under fusl

R=viettrungluu@chromium.org

Review URL: https://codereview.chromium.org/1701193002 .

Cr-Mirrored-From: https://github.com/domokit/mojo
Cr-Mirrored-Commit: 40c700d9b8da5bc6cc4cceec406b1aa4f48e986b

mojo_test

diff --git a/mojo_test b/mojo_test
index d72bb82..59f5310 100755
--- a/mojo_test
+++ b/mojo_test
@@ -11,6 +11,7 @@
 import argparse
 import logging
 import sys
+import os.path
 
 from devtoolslib import apptest_dart
 from devtoolslib import apptest_gtest
@@ -80,7 +81,10 @@
     return 1
 
   target_os = "android" if script_args.android else "linux"
-  test_list_globals = {"target_os": target_os}
+  test_list_globals = {
+    "shell_path": config.shell_path,
+    "target_os": target_os,
+  }
   exec script_args.test_list_file in test_list_globals
   test_list = test_list_globals["tests"]