Ruby

Fix special methods accessibility. #7007

Job	Run time
C99_compile (3.4)	1m 52s
C99_compile (head)	1m 15s
test (3.1, test)	2m 52s
valgrind	51m 24s
test (3.2, test)	2m 58s
test (3.3, test)	3m 17s
test (3.4, test)	3m 3s
test (head, test)	3m 44s
test (head, stdlib_test rubocop)	3m 4s
test (3.4, stdlib_test)	2m 19s
test (3.4, test, --enable-frozen-string-literal)	3m 0s
test (3.4, stdlib_test, --enable-frozen-string-literal)	2m 19s
test (3.4, rubocop validate test_doc build test_generate_stdlib raap)	2m 44s
test (3.4, typecheck_test)	1m 10s
	1h 25m 1s

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