Criterion crashes (SIGABRT) when providing own main

[László Várady]

When providing your own main() function, the Criterion test framework crashes with the following error:

> criterion: Re-entering criterion from a test worker. This is a catastrophic bug, please report it on the issue tracker.
> Bailing out to avoid fork-bombing the system.
> criterion: Could not spawn test instance: Protocol error
> Aborted (core dumped)

More info and reproducer steps:
https://github.com/Snaipe/Criterion/issues/495

This happens because unlike in Debian builds, Ubuntu compiles Criterion with the -Bsymbolic-functions linker flag, which prevents Criterion from finding the user's main function.

Since this functionality is part of Criterion's features, I think disabling the linker flag would be a suitable fix.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.