[RTEMS Project] #3988: Remove deprecated rtems_extension

[RTEMS trac]

#3988: Remove deprecated rtems_extension
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  Reporter:  Sebastian Huber  |      Owner:  Sebastian Huber
      Type:  task             |     Status:  assigned
  Priority:  normal           |  Milestone:  6.1
 Component:  rtems            |    Version:  6
  Severity:  normal           |   Keywords:
Blocked By:                   |   Blocking:
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Ticket URL: <http://devel.rtems.org/ticket/3988>
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