RESTRICT AUTOMERGE: Remove -Weverything

Bug: 113696918

This got removed at one point in master, though we haven't found the
commit that does so. -Weverything is problematic because it includes
uncurated warnings that may conflict with each other or otherwise not be
helpful.

Change-Id: I519355593ef11d74d9b4a78d77c3a8c7bb270851
1 file changed