zsh: Upgrade 5.9 -> 5.9.1

* Upstream changed from pcre to pcre2
* with-tcsetpgrp was dropped in "53081: remove old BeOS support code"

Changes

* POSIX real-time signals (SIGRTMIN etc) are now supported by the kill and
  trap builtins, TRAP* functions, and the signals parameter, where available.

* The kill builtin learnt a new option -q to send the signal via
  sigqueue(3) along with an arbitrary integer value, where available.

* The kill builtin also learnt a new -L option to print a list of all known
  signal numbers and their names.

* The new completion helper _as_if can be used to complete one command as
  if it were another command with particular arguments.

Signed-off-by: Jörg Sommer <joerg.sommer@navimatix.de>
Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>

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