This helps functions like tmpnam() and tmpfile() to "just work", like
their Java equivalents.
Bug: https://issuetracker.google.com/36991167
Bug: http://b/174682340
Test: atest FrameworksCoreTests:android.app.activity.ActivityThreadTest
Change-Id: Ife785f0ca69a34ba2c6b5d1e8e23f8b883d8fc8f