Test

Remove unused variable in epollexclusive.h #686

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Run time

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Job	Run time
Ruby ruby-head	20s
Ruby 3.3	2m 21s
Ruby 3.2	2m 27s
Ruby 3.1	2m 41s
Ruby 3.0	2m 30s
Ruby 2.7	2m 47s
Ruby 2.6	2m 50s
	15m 56s