[patch] Set safe_mode=off by default

In my web hosting I get:

PHP safe mode is activated. Drush requires that safe mode is         [error]

disabled.

Drush could not execute.                                             [error]

So it should be turned off by default in drush_terminal.terminal.inc :

exec("$php -d safe_mode=off $drush -- --no-color -r '$root' " . $args, $output);

Workaround for the user is to append "-d safe_mode=off" in PHP Path.