This patch removes all the instances of %T from offload/ (only one test
contained this construction). %T has been deprecated for ~7 years and is
not reccomended as it does not use a unique directory per test. Switch
to using %t to ensure we use a unique dir per test and so that we can
eventually remove %T.
I did not actually test this. A couple feeble attempts at
building/running the offload tests just leaves me with a ton of test
failures. Given how small this is I'm reasonably sure it works though.
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