Add support for rm-sync in xochitl package

[timower]

Recent xochitl versions renamed the sync service and binary to rm-sync. This updates the xochitl package to support both.

[Eeems]

@timower poke

[Eeems]

@timower poke

[timower]

Verified on 2.15 (upgrade, fresh install & remove) and 3.5 (fresh install & remove). Seems to work

[timower]

I cannot build any packages locally anymore, as I'm always running into:

# make xochitl
./scripts/package_build.py  "xochitl"
Traceback (most recent call last):
  File "/src/./scripts/package_build.py", line 44, in <module>
    repo = Repo(paths.RECIPE_DIR, paths.REPO_DIR)
  File "/src/scripts/toltec/repo.py", line 60, in __init__
    self.generic_recipes[name] = GenericRecipe.from_file(
  File "/src/scripts/toltec/recipe.py", line 46, in from_file
    return GenericRecipe(name, path, recipe.read())
  File "/src/scripts/toltec/recipe.py", line 59, in __init__
    variables, functions = bash.get_declarations(definition)
  File "/src/scripts/toltec/bash.py", line 147, in get_declarations
    assert next_token == "("
AssertionError

I tried different python versions and some docker image, without success.

[Eeems]

Python 3.10 is currently required for the toltec build system. Toltecmk supports 3.11, but hasn't been fully updated to do everything the toltec build system does.

[Eeems]

@timower unfortunately preupgrade won't run when upgrading from a previous package to this package, only configure from this package runs: https://github.com/toltec-dev/toltec/blob/stable/docs/package.md#install-section

@matteodelabre I'm not sure how the current pre/post upgrade scripts work makes sense as this keeps coming up. It's basically impossible to know what pre/post upgrade steps should be run until you are writing the new package. I think it might be worth us changing this longer term so that pre/post upgrade are run from package B along with configure. That or we start building some standards on what should actually be in those scripts by default in a package.