i#4058 appveyor: Add client.alloc to flaky list (#4206)
i#4058 appveyor: Add client.alloc to flaky list (#4206)

Adds client.alloc to the list of tests failing with the new Appveyor
VS2017/Win10 image.

Issue: #4058
AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio