unittest/main: do not intialize xtimer if ztimer_xtimer_compat #18352
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@miri64 found an issue with unittest and ztimer_sleep in
#17680 (comment)
PR #18312 identified a potential double initialization of ztimer.
Contribution description
this removes the xtimer initialzation call if xtimer is used via ztimer_xtimer_compat. (this is the same behavior found in
auto_init
)Testing procedure
see #18312
Issues/PRs references