textproc/saxon-he: Improve wrapper scripts

- make robust and put the literal string first in the script's
  IAM comparison so that in no case can it start with a dash
- make efficient and use Makefile's :tsc (:ts:) transform to
  get classpath-ready colon-separated jars list without assembling
  it in the script each time.
    Else you could avoid adding the leading colon like so:
  SAXON_CLASSPATH="${SAXON_CLASSPATH}${SAXON_CLASSPATH:+:}${jarfile}"
- install saxon-xquery as symlink instead of a copy
- add saxon and saxon-xquery scripts to post-stage smoke test
- bump PORTREVISION which was deferred from prior commit

PR:		286764

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