Makefile.in: Clone benchmark-driver repository in benchmark/benchmark-driver
  `make update-benchmark-driver`, like simplecov.
win32/Makefile.sub: Roughly do the same thing.
.gitignore: Ignore the cloned repository.
common.mk: Trigger `make update-benchmark-driver` to run `make benchmark`
  and adjust arguments for benchmark_driver.gem.

benchmark/require.yml: renamed from benchmark/bm_require.rb, benchmark/prepare_require.rb
benchmark/require_thread.yml: renamed from benchmark/bm_require_thread.rb, benchmark/prepare_require_thread.rb
benchmark/so_count_words.yml: renamed from benchmark/bm_so_count_words.rb, benchmark/prepare_so_count_words.rb,
  benchmark/wc.input.base
benchmark/so_k_nucleotide.yml: renamed from benchmark/bm_so_k_nucleotide.rb, benchmark/prepare_so_k_nucleotide.rb,
  benchmark/make_fasta_output.rb
benchmark/so_reverse_complement.yml: renamed from benchmark/bm_so_reverse_complement.rb, benchmark/prepare_so_reverse_complement.rb,
  benchmark/make_fasta_output.rb

I'm sorry but I made some duplications between benchmark/require.yml and benchmark/require_thread.yml,
and between benchmark/so_k_nucleotide.yml and benchmark/so_reverse_complement.yml.

If you're not comfortable with it, please combine these YAMLs to share
the same prelude. One YAML file can have multiple benchmark definitions
sharing prelude.

benchmark/driver.rb: Replace its core feature with benchmark_driver.gem.
  Some old features are gone for now, but I'll add them again later.

[Misc #14902]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63888 b2dd03c8-39d4-4d8f-98ff-823fe69b080e