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XTIMER_BACKOFF and XTIMER_ISR_BACKOFF were defined in periph_conf.h since 2016 for the legacy xtimer module, which required high backoff values (200) on native to prevent timer underflow issues. However, since the migration to ztimer, all code now uses MODULE_ZTIMER_XTIMER_COMPAT which includes ztimer/xtimer_compat.h before periph_conf.h. This means xtimer_compat.h always defines XTIMER_BACKOFF=1 first, and the periph_conf.h definitions are never used. Remove these unused definitions as they serve no purpose with the current ztimer-based implementation. Signed-off-by: Gilles DOFFE <g.doffe@gmail.com>