zsh 5.4-to-be features in use

[danielshahaf]

The following zsh 5.4-to-be behaviours are used in the code, and must not appear in a z-sy-h release until they have appeared in a zsh release:

• ALIAS_FUNC_DEF option (9523d6d)
• workaround for PAT_STATIC bug in zsh #415 (which fixes history-incremental-pattern-search-backward is broken after upgrading to zsh 5.3.1 #407) assumes workers/40285
  • pushed in 4627796
  • update references to "5.3.2" to "5.4" or "5.3.1.1"
  • if upstream reverts workers/40285, revert or adapt workaround for PAT_STATIC bug in zsh #415 fix.

[danielshahaf]

As expected, neither of these features was changed upstream prior to upstream's tag.