libmisc: Simplify <rtems/stackchk.h>

Drop the <rtems/score/percpu.h> include since this file exposes a lot of
implementation details.

cpukit/libmisc/stackchk/check.c

@@ -41,6 +41,7 @@
 
 #include <rtems/bspIo.h>
 #include <rtems/stackchk.h>
+#include <rtems/score/percpu.h>
 #include "internal.h"
 
 /*

cpukit/libmisc/stackchk/stackchk.h

@@ -24,7 +24,7 @@
 
 #include <stdbool.h> /* bool */
 
-#include <rtems/score/percpu.h> /* Thread_Control */
+#include <rtems/score/thread.h> /* Thread_Control */
 #include <rtems/bspIo.h>
 
 /**

testsuites/libtests/stackchk/blow.c

@@ -17,6 +17,7 @@
 
 #include <rtems.h>
 #include <rtems/stackchk.h>
+#include <rtems/score/percpu.h>
 
 /* forward declarations to avoid warnings */
 void b(void);