erts: Patch 1252

      OTP-11164 +sfwi Interval
        Set scheduler forced wakeup interval. All run queues will be scanned
        each Interval milliseconds. While there are sleeping schedulers in
        the system, one scheduler will be woken for each non-empty run queue
        found. An Interval of zero disables this feature, which also is the
        default.

        This feature has been introduced as a temporary workaround for lengthy
        executing native code, and native code that do not bump reductions
        properly in OTP. When these bugs have be fixed the +sfwi flag will
        be removed.