[bundler/bundler] Don't use system bundler on this spec

If we use system bundler, when booting the "outermost" bundler process,
bundler will save the path to the system bundler in BUNDLE_BIN_PATH, and
use it again when booting the "innermost" bundler process (`bundle exec
echo foo`).

That means that second process will use the system bundler path again.
However, we have `-rsupport/hax` in RUBYOPT, so that file will load from
the local copy of bundler, and that file will load `bundler/version`
from the project (not from system), because -Ilib is in the LOAD_PATH.

That will end up causing redefinition errors because the same constant
will be loaded from two different locations.

In general, this is expected behavior, normally you will wrap the
process with `Bundler.with_original_env` to reset the environment.
However, the easiest fix here is to not use system bundler, because it's
not really necessary and thus doesn't help the readability of the spec.

https://github.com/bundler/bundler/commit/a3d72a34ab

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