[ruby/rubygems] build gems directly instead of shelling out

I'm trying to speed up the bundler tests. The tests shell out a lot in
order to build gems. We can build gems without creating a sub-process.
This change reduced the test suite time from ~24 minutes, to about ~21
minutes on my machine.  Once we have more of these "asset generation"
routines done in the same process, I think we can start caching the
outputs for further improvements

https://github.com/ruby/rubygems/commit/ebf27056c6

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