psxtmtests - Eliminate missing prototype warnings

testsuites/psxtmtests/psxtmmutex01/init.c

@@ -1,5 +1,5 @@
 /*
- *  COPYRIGHT (c) 1989-2011.
+ *  COPYRIGHT (c) 1989-2012.
  *  On-Line Applications Research Corporation (OAR).
  *
  *  The license and distribution terms for this file may be
@@ -17,6 +17,9 @@
 #include <pthread.h>
 #include "test_support.h"
 
+/* forward declarations to avoid warnings */
+void *POSIX_Init(void *argument);
+
 pthread_mutex_t MutexId;
 
 static void test_mutex_create(void)