testsuites/libtests: Address unused parameter warnings

Add "(void) param;" annotation to address unused parameter warnings.
Found with GCC's warning -Wunused-parameter.

testsuites/libtests/debugger01/init.c

@@ -61,6 +61,8 @@ const char rtems_test_name[] = "DEBUGGER01";
 
 rtems_task Init(rtems_task_argument argument)
 {
+  (void) argument;
+
   TEST_BEGIN();
 
   test();

testsuites/libtests/dl13/init.c

@@ -62,6 +62,8 @@ static int test(void)
 
 static void Init(rtems_task_argument arg)
 {
+  (void) arg;
+
   int te;
 
   TEST_BEGIN();