Use 'printf' (POSIX issue 4) instead of 'echo -n', for portability.

The problem with using 'echo -n' is that it is not portable.  While BSD systems
required that the '-n' option be removed and interpreted, System V required
that all strings should be echoed with no interpretation of options.  This
fundamental difference of behavior means that it is never possible to use the
'-n' flag to echo in tests which are meant to be portable.

In this case, on Mac OS X 10.6, the /bin/sh shell builtin 'echo' uses the
System V semantics of the command, and thus the SHELL test failed on that
platform.

http://pubs.opengroup.org/onlinepubs/009695399/utilities/echo.html#tag_04_41_16


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@327793 65c4cc65-6c06-0410-ace0-fbb531ad65f3

tests/test_substitution.c

@@ -261,8 +261,8 @@ AST_TEST_DEFINE(test_substitution)
 	TEST(test_expected_result(test, c, "A${${baz}o:-2:-1}A", "A2A"));
 	pbx_builtin_setvar_helper(c, "list1", "ab&cd&ef");
 	TEST(test_expected_result(test, c, "${LISTFILTER(list1,&,cd)}", "ab&ef"));
-	TEST(test_expected_result(test, c, "${SHELL(echo -n 123)},${SHELL(echo -n 456)}", "123,456"));
-	TEST(test_expected_result(test, c, "${foo},${CDR(answer)},${SHELL(echo -n 456)}", "123,,456"));
+	TEST(test_expected_result(test, c, "${SHELL(printf '%d' 123)},${SHELL(printf '%d' 456)}", "123,456"));
+	TEST(test_expected_result(test, c, "${foo},${CDR(answer)},${SHELL(printf '%d' 456)}", "123,,456"));
 	TEST(test_expected_result(test, c, "${foo},${this_does_not_exist},${THIS_DOES_NOT_EXIST(either)}", "123,,"));
 #undef TEST