Revert "Disable -Wtautological-unsigned-zero-compare"

This reverts commit 66db2192b5067a53a3d901d56f4b8155fb7e9b85.

Reason for revert: This is only supported by the new toolchain.

Change-Id: I0e6a6950118bfa00ba6d111fa56d68839e7d8864
1 file changed