test

Add warning output when using %require, which exists only for compati… #517

Job	Run time
steep-check (head)	31s
check-misc (head)	11s
test-memory (head)	35s
test-ruby (head, master)	6m 0s
test-windows (head)	2m 16s
test-ruby (3.0, master)	5m 51s
ruby-versions / Generate Ruby versions	1s
test-cpp (head, g++)	12s
test-cpp (head, clang++)	16s
test (2.5)	30s
test (2.6)	28s
test (2.7)	29s
test (3.0)	15s
test (3.1)	20s
test (3.2)	16s
test (3.3)	18s
test (head)	13s
	18m 42s

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