[RTEMS Project] #3387: Add subdir-objects to automake flags

[RTEMS trac]

#3387: Add subdir-objects to automake flags
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  Reporter:  Chris Johns  |      Owner:  Chris Johns
      Type:  defect       |     Status:  assigned
  Priority:  normal       |  Milestone:  5.1
 Component:  build        |    Version:  5
  Severity:  normal       |   Keywords:
Blocked By:               |   Blocking:
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 Adding this silences the warning in automake-1.16.1 so we can upgrade to
 that version.

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Ticket URL: <http://devel.rtems.org/ticket/3387>
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