wrap: Remove dead code trying to update git/hg/svn repositories

If the directory exists we early return or raise exception in resolve()
method. It was already like that even before the recent refactoring of
the code.

It is safer like that anyway, we don't want a project reconfigure to
silently pull new code. Updating subprojects should be an explicit
action of the user. For example gst-build has a 'git-update' script that
does that. In the future we could add a 'meson subprojects update'
command.

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