POSIX timers: Add restrict keyword

+ timer_create()
+ timer_settime()

cpukit/posix/src/timercreate.c

@@ -34,8 +34,8 @@
 
 int timer_create(
   clockid_t        clock_id,
-  struct sigevent *evp,
-  timer_t         *timerid
+  struct sigevent *__restrict evp,
+  timer_t         *__restrict timerid
 )
 {
   POSIX_Timer_Control *ptimer;

cpukit/posix/src/timersettime.c

@@ -33,8 +33,8 @@
 int timer_settime(
   timer_t                  timerid,
   int                      flags,
-  const struct itimerspec *value,
-  struct itimerspec       *ovalue
+  const struct itimerspec *__restrict value,
+  struct itimerspec       *__restrict ovalue
 )
 {
   POSIX_Timer_Control *ptimer;