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The poll timeout wasn't updated when triggered too soon, it's fixed.
And 1ms is added to the timeout to compensate precision loss.

Depending on the skew value and announce periodicity, the master
expiration date might be reset all the time. In this case multilive will
never get up.

struct ip is available on Apple systems.

Fix this warning from glibc:

/usr/include/features.h:183:3: warning: #warning "_BSD_SOURCE and
_SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp]

Keep _BSD_SOURCE for backward compatibility.

    This is required to be set and be equal to write size on FreeBSD.
    Note that despite documentation says it should be in host order,
    it only works if specified in network order

commit b551ed495bcc508e614fd14a25912301b1122a17
Author: Dmitry Marakasov <amdmi3@amdmi3.ru>
Date:   Fri Oct 7 17:32:44 2016 +0300

commit 4bc7d9cf77864ea32367cd80e37daa2ea1c630eb
Author: Dmitry Marakasov <amdmi3@amdmi3.ru>
Date:   Fri Oct 7 17:30:42 2016 +0300

commit e7e736d85ca80bb6e5b9c9694a1c002d1875b5c0
Author: Dmitry Marakasov <amdmi3@amdmi3.ru>
Date:   Fri Oct 7 17:22:59 2016 +0300

commit e55acfd1a11b2891e8bb467ac8e147ef58a82ce1
Author: Dmitry Marakasov <amdmi3@amdmi3.ru>
Date:   Fri Oct 7 17:22:12 2016 +0300

commit 8afbeacfce52d43b7ffb92eead2fccfab7f575ba
Author: Dmitry Marakasov <amdmi3@amdmi3.ru>
Date:   Fri Oct 7 17:19:05 2016 +0300

only available with uClibc if the C library is build with NPTL support (sets
__UCLIBC_HAS_THREADS_NATIVE__) and __UCLIBC_HAS_ADVANCED_REALTIME__ set.
Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>