Added prototype of _POSIX_Semaphore_Delete to avoid warnings.

c/src/exec/posix/include/rtems/posix/semaphore.h

@@ -128,6 +128,18 @@ int _POSIX_Semaphore_Create_support(
   POSIX_Semaphore_Control  **the_sem
 );
 
+/*
+ *  _POSIX_Semaphore_Delete
+ *
+ *  DESCRIPTION:
+ *
+ *  This routine supports the sem_close and sem_unlink routines.
+ */
+
+void _POSIX_Semaphore_Delete(
+  POSIX_Semaphore_Control *the_semaphore
+);
+
 /*
  *  _POSIX_Semaphore_Wait_support
  *