This is a good workaround for #2577 in order to make the error more legible, but it's ultimately not a fix. bundle exec on the CLI works, as does the 'direct' spawn method, so we need to figure out what's really going on here.

@CamJN I have analyzed the root cause and identified a better fix strategy. Please see:
#2577 (comment)
#2577 (comment)

We can just do what puma does, and use Process.setproctitle, then it doesn't matter what bundler decides to do, or what version users are running. Works back to ~ Ruby 2.1.