Bug 1532462 - Avoid permission error in Android cppunittests on some devices by creating destination directory; r=bc

Differential Revision: https://phabricator.services.mozilla.com/D22034

--HG--
extra : moz-landing-system : lando

testing/remotecppunittests.py

@@ -42,6 +42,7 @@ class RemoteCPPUnitTests(cppunittests.CPPUnitTests):
         self.device.rm(self.remote_test_root, force=True, recursive=True)
         self.device.mkdir(self.remote_home_dir, parents=True)
         self.device.mkdir(self.remote_tmp_dir)
+        self.device.mkdir(self.remote_bin_dir)
         self.push_libs()
         self.push_progs(progs)
         self.device.chmod(self.remote_bin_dir, recursive=True, root=True)