Fixup method_defined? usage #407

Job	Run time
ruby-versions / Generate Ruby versions	4s
windows-latest 2.7	1m 16s
windows-latest 3.0	45s
windows-latest 3.1	51s
windows-latest 3.2	52s
windows-latest 3.3	48s
windows-latest 3.4	40s
windows-latest jruby-head	1m 12s
windows-latest mingw	37s
windows-latest mswin	1m 3s
	8m 8s

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