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Francisco Molina 81c5d5dbcc sys/event/timeout: split xtimer, ztimer backends, don't force usec

This PR makes `event_timeout` and `event_timeout_ztimer` two distinct
pseudomodules, where the only api difference is in the init function.

If only `event_timeout_ztimer` is selected then no default ZTIMER
backend is selected and the old init function is not implemented.

If only `event_timeout` is selected then `xtimer` is used unless
`ztimer_usec` is included. In which case the `xtimer` wrapper on top
of `ztimer` is used and `xtimer` is not directly selected. This
allows for the legacy api to be supported with `ztimer_usec` as
a drop-in replacement.

If `event_timeout` and `event_timeut_ztimer` are selected then
`event_timeout` SRC file is excluded from compilation.

2021-11-17 10:15:11 +01:00

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 SRC := event.c
 SUBMODULES := 1
 ifneq (,$(filter event_timeout_ztimer,$(USEMODULE)))
   ifneq (,$(filter ztimer_usec,$(USEMODULE)))
     SUBMODULES_NO_SRC += timeout.c
   endif
 endif
 include $(RIOTBASE)/Makefile.base