Add message to test output if a test is aborted due to a timeout.
Without this an aborted test could produce an empty .err file so the diff
looks like as if all lines of the .out files are just missing for some unknown
reason.
changeset: 0:0acdaf898367
tag: tip
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: test
b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3 644 a
a
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