posix: Delete POSIX_API_Control::ss_high_priority

This field was unused.

cpukit/posix/include/rtems/posix/threadsup.h

@@ -51,11 +51,6 @@ typedef struct {
   int                     schedpolicy;
   /** This is the thread's current set of scheduling parameters. */
   struct sched_param      schedparam;
-  /**
-   * This is the high priority to execute at when using the sporadic
-   * scheduler.
-   */
-  int                     ss_high_priority;
   /**
    * This is the timer which controls when the thread executes at
    * high and low priority when using the sporadic scheduler.

cpukit/posix/src/pthreadsetschedparam.c

@@ -100,10 +100,6 @@ int pthread_setschedparam(
         rtems_configuration_get_ticks_per_timeslice();
       new_priority = _POSIX_Priority_To_core( api->schedparam.sched_priority );
       break;
-
-    case SCHED_SPORADIC:
-      api->ss_high_priority = api->schedparam.sched_priority;
-      break;
   }
 
   _Thread_State_release( the_thread, &lock_context );