[PATCH] support: Add support for delayed test failure reporting

[Florian Weimer]

I need this for the container and resolver tests, which may end up 
detecting errors in code which does not run on the main thread/process.

A MAP_SHARED mapping is used to share the test status across the entire 
process group spawned from the test driver.

Torvald, do the concurrency bits in support/support_record_failure.c 
look okay to you?

Thanks,
Florian
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