Extract Racc::VERSION from racc/info.rb at extconf.rb #4

Job	Run time
ruby-versions / Generate Ruby versions	4s
test (2.5, ubuntu-latest)	30s
test (2.5, macos-latest)	56s
test (2.5, windows-latest)	3m 10s
test (2.6, ubuntu-latest)	33s
test (2.6, macos-latest)	1m 12s
test (2.6, windows-latest)	3m 6s
test (2.7, ubuntu-latest)	36s
test (2.7, macos-latest)	55s
test (2.7, windows-latest)	2m 50s
test (3.0, ubuntu-latest)	22s
test (3.0, macos-latest)	27s
test (3.0, windows-latest)	1m 28s
test (3.1, ubuntu-latest)	20s
test (3.1, macos-latest)	36s
test (3.1, windows-latest)	2m 23s
test (3.2, ubuntu-latest)	30s
test (3.2, macos-latest)	38s
test (3.2, windows-latest)	3m 54s
test (head, ubuntu-latest)	37s
test (head, macos-latest)	34s
test (head, windows-latest)	2m 10s
test (jruby, ubuntu-latest)	6m 54s
test (jruby-head, ubuntu-latest)	6m 26s
test (truffleruby, ubuntu-latest)	2m 15s
test (truffleruby-head, ubuntu-latest)	3m 12s
	46m 38s

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