score: Add INTERNAL_ERROR_CPU_ISR_INSTALL_VECTOR

Use INTERNAL_ERROR_CPU_ISR_INSTALL_VECTOR on PowerPC for
_CPU_ISR_install_vector().

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

@@ -132,25 +132,3 @@ void _CPU_Context_Initialize(
   _CPU_Context_initialize_altivec(the_context);
 #endif
 }
-
-/*  _CPU_ISR_install_vector
- *
- *  This kernel routine installs the RTEMS handler for the
- *  specified vector.
- *
- *  Input parameters:
- *    vector      - interrupt vector number
- *    old_handler - former ISR for this vector number
- *    new_handler - replacement ISR for this vector number
- *
- *  Output parameters:  NONE
- */
-
-void _CPU_ISR_install_vector(
-  uint32_t    vector,
-  proc_ptr    new_handler,
-  proc_ptr   *old_handler
-)
-{
-  BSP_panic("_CPU_ISR_install_vector called\n");
-}