Run the test only if Test::Deep is available

Not accepted by upstream (instead they put Test::Deep as a requirement for

DBD::mysql)

--- DBD-mysql-4.035/t/87async.t 2016-07-26 06:28:30.550483257 -0700

+++ DBD-mysql-4.035/t/87async.t 2016-07-26 06:27:51.584879116 -0700

@@ -1,12 +1,18 @@

use strict;

use warnings;

-use Test::Deep;

use Test::More;

use DBI;

use DBI::Const::GetInfoType;

use Time::HiRes;

+BEGIN {

+ eval { require Test::Deep };

+ if ($@) {

+ plan skip_all => 'Test::Deep is not installed!';

+ }

+}

+

use vars qw($test_dsn $test_user $test_password);

use lib 't', '.';

require 'lib.pl';