[RTEMS Project] #3409: Strip down configure checks to the bare minimum

[RTEMS trac]

#3409: Strip down configure checks to the bare minimum
------------------------------+-----------------------------
  Reporter:  Sebastian Huber  |      Owner:  Sebastian Huber
      Type:  task             |     Status:  assigned
  Priority:  normal           |  Milestone:  5.1
 Component:  build            |    Version:  5
  Severity:  normal           |   Keywords:
Blocked By:                   |   Blocking:
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 There are a lot of configure checks which produce HAVE_* defines which are
 no longer used or superfluous since we demand a recent Newlib version
 anyway.

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Ticket URL: <http://devel.rtems.org/ticket/3409>
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