[RTEMS Project] #4438: powerpc/shared/irq/ppc-irq-legacy.c: Use rtems_malloc() not malloc()

[RTEMS trac]

#4438: powerpc/shared/irq/ppc-irq-legacy.c: Use rtems_malloc() not malloc()
----------------------------+--------------------
  Reporter:  Joel Sherrill  |      Owner:  (none)
      Type:  defect         |     Status:  new
  Priority:  normal         |  Milestone:  6.1
 Component:  bsps           |    Version:  6
  Severity:  normal         |   Keywords:
Blocked By:                 |   Blocking:
----------------------------+--------------------
 malloc() is required to set errno which implicitly references the newlib
 reentrancy structure. Changing this eliminates one reason the reentrancy
 code may be pulled into minimum.exe.

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Ticket URL: <http://devel.rtems.org/ticket/4438>
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