[pkgsrc/trunk]: pkgsrc/shells/zsh Update to 5.6

[wen <wen%pkgsrc.org@localhost>]

details:   https://anonhg.NetBSD.org/pkgsrc/rev/84a47f1bcd18
branches:  trunk
changeset: 312632:84a47f1bcd18
user:      wen <wen%pkgsrc.org@localhost>
date:      Sun Sep 09 00:46:52 2018 +0000

description:
Update to 5.6

Upstream changes:
Changes from 5.5.1-test-2 to 5.6
--------------------------------

CVE-2018-0502: Data from the second line of a #! script file might be passed to
execve().  For example, in the following situation -