use require_relative to reduce syscalls at startup

require_relative appeared in Ruby 1.9.2 to speed up load times by
avoiding needless open() syscalls.  This has no effect if you're using
RUBYLIB or the '-I' option when running ruby(1), but avoids searching
paths in other gems.

This does not affect unicorn greatly as unicorn does not activate many
gems, but still leads to reducing ~45 syscalls during startup.

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