Freedom K25Z:  Fix missing file inclusion in board Makefile.  From Alan Carvalho de Assis
alling mq_timedreceived with immediate timeout was getting stuck and not
timeout. Immediate timeout is achieved by setting absolute timeout value to
past time, for example abstime={ .tv_sec=0, .tv_nsec=0 }. However absolute
time was converted to relative time using unsigned integer arithmetic and
resulted large ticks count by clock_abstime2ticks, instead of expected negative
ticks value.

Patch corrects clock_abstime2ticks to return negative ticks, if absolute time
is in the past.

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@haltian.com>
poll() was not waking up from signals (for example mq_notify() events).

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@haltian.com>
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Simplifed semaphore wait logic in poll()
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Fixing md5 hashing when digest[$i] lower that 16.  Sergey <sectus@mail.ru>
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Cosmetic chnages to comments
STM32 F4 OTGHS device controller driver from Brennan Ashton
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Refresh STM32F429i Disco USB NSH configuration
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Update README
SAMA5D3 Xplained:  Add an apps/examples/bridge configuration
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Remove warnings when  CONFIG_NXTK_BORDERWIDTH is set to zero.  From Pierre-Noel Bouteville
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vfs/poll: add proper handling for sem_timedwait errnos.  From Jussi Kivilinna
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