[RTEMS Project] #2459: Add rtems_chain_get_first_unprotected() to chain API

[RTEMS trac]

#2459: Add rtems_chain_get_first_unprotected() to chain API
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 Reporter:  sebastian.huber  |      Owner:  sebastian.huber
     Type:  enhancement      |     Status:  new
 Priority:  normal           |  Milestone:  4.12
Component:  cpukit           |    Version:  4.12
 Severity:  normal           |   Keywords:
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Ticket URL: <http://devel.rtems.org/ticket/2459>
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