Fix stdlib/tst-setcontext3 with dash [BZ#18418]

This patch remove the non-portable array usage on tst-setcontext3.sh
script.

ChangeLog

@@ -1,3 +1,8 @@
+2015-05-17  Adhemerval Zanella  <adhemerval.zanella@linaro.org>
+
+	[BZ #18418]
+	* stdlib/tst-setcontext3.sh: Remove non-portable array use.
+
 2015-05-15  Joseph Myers  <joseph@codesourcery.com>
 
 	[BZ #16352]

NEWS

@@ -18,7 +18,7 @@ Version 2.22
   18039, 18042, 18043, 18046, 18047, 18068, 18080, 18093, 18100, 18104,
   18110, 18111, 18125, 18128, 18138, 18185, 18196, 18197, 18206, 18210,
   18211, 18217, 18220, 18221, 18247, 18287, 18319, 18333, 18346, 18397,
-  18409.
+  18409, 18418.
 
 * Cache information can be queried via sysconf() function on s390 e.g. with
   _SC_LEVEL1_ICACHE_SIZE as argument.

stdlib/tst-setcontext3.sh

@@ -1,4 +1,4 @@
-#! /bin/bash
+#! /bin/sh
 # Bug 18125: Test the exit functionality of setcontext().
 # Copyright (C) 2015 Free Software Foundation, Inc.
 # This file is part of the GNU C Library.
@@ -29,14 +29,12 @@ test_pre="${test_program_prefix_before_env} ${run_program_env}"
 test="${test_program_prefix_after_env} ${objpfx}tst-setcontext3"
 out=${objpfx}tst-setcontext3.out
 
-tempfiles=()
 cleanup() {
-  rm -f "${tempfiles[@]}"
+  rm -f $tempfile
 }
 trap cleanup 0
 
 tempfile=$(mktemp "tst-setcontext3.XXXXXXXXXX")
-tempfiles+=("$tempfile")
 
 # We want to run the test program and see if secontext called
 # exit() and wrote out the test file we specified.  If the