Log Message:
zsh: Upgrade to 5.4.2

pkgsrc changes:
 - Use PRINT_PLIST_AWK to aid future upgrades.
 - Support the "static" option on Darwin and SunOS.

Upstream changes from 5.3.1 to 5.4:

The 'exec' and 'command' precommand modifiers, and options to them, are
now parsed after parameter expansion.  Previously, both the modifier and
any options to it were parsed between alias expansion and parameter
expansion (see zshexpn(1)), so they could neither be quoted nor be the
result of parameter expansion.  Examples: 's=command; $s -V ls' and
'\command -V ls' now work as expected.

Functions executed by ZLE widgets no longer have their standard input
closed, but redirected from /dev/null instead. That still guards
against user defined widgets inadvertently reading from the tty device.

There is an option WARN_NESTED_VAR, a companion to the existing
WARN_CREATE_GLOBAL that causes a warning if a function updates a
variable from an enclosing scope without using typeset -g.  It can be
turned on for an individual function with "functions -W".

zmodload now has an option -s to be silent on a failure to find a module
but still print other errors.