powerpc: Delete _CPU_Install_interrupt_stack()

This function is only used if CPU_HAS_HARDWARE_INTERRUPT_STACK == TRUE.

c/src/lib/libcpu/powerpc/new-exceptions/cpu.c

@@ -133,15 +133,6 @@ void _CPU_Context_Initialize(
 #endif
 }
 
-/*PAGE
- *
- *  _CPU_Install_interrupt_stack
- */
-
-void _CPU_Install_interrupt_stack( void )
-{
-}
-
 /*  _CPU_ISR_install_vector
  *
  *  This kernel routine installs the RTEMS handler for the

cpukit/score/cpu/powerpc/rtems/score/cpu.h

@@ -944,17 +944,6 @@ void _CPU_ISR_install_vector(
   proc_ptr   *old_handler
 );
 
-/*
- *  _CPU_Install_interrupt_stack
- *
- *  This routine installs the hardware interrupt stack pointer.
- *
- *  NOTE:  It need only be provided if CPU_HAS_HARDWARE_INTERRUPT_STACK
- *         is TRUE.
- */
-
-void _CPU_Install_interrupt_stack( void );
-
 /*
  *  _CPU_Context_switch
  *