zsh: update to 5.9.1

zsh: update to 5.9.1

Removed upstreamed patches:
- 001-50658-test-Enable-to-switch-between-C-UTF-8-locales-.patch
- 002-51723-migrate-pcre-module-to-pcre2.patch
- 005-51877-do-not-build-pcre-module-if-pcre2-config-is-no.patch
- 006-52383-Avoid-incompatible-pointer-types-in-terminfo-g.patch

Remaining patches automatically rebased and filenames renumbered.

Changelog:
Incompatibilities
- PCRE support is now PCRE2.
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: John Audia <redacted>