[rubygems/rubygems] Add support in binstubs for trampolining bundler

If `bundler _<version>_` is given, I guess the most reasonable approach
is to completely skip version switching, because the user is technically
opting out of it. But since binstubs completely remove this argument
from `ARGV` after processing it, we have no way of detecting that it was
actually passed in the first place in order to skip the feature. So we
set `BUNDLER_VERSION` explicitly in this case.

https://github.com/rubygems/rubygems/commit/e0f360d6d7

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