build

Fix sysconfdir when load-relative #221

Job	Run time
ruby-versions / Generate Ruby versions	2s
build (2.6 / ubuntu-latest)	25s
build (2.6 / macos-latest)	44s
build (2.7 / ubuntu-latest)	22s
build (2.7 / macos-latest)	30s
build (3.0 / ubuntu-latest)	19s
build (3.0 / macos-latest)	21s
build (3.1 / ubuntu-latest)	13s
build (3.1 / macos-latest)	17s
build (3.2 / ubuntu-latest)	14s
build (3.2 / macos-latest)	15s
build (3.3 / ubuntu-latest)	16s
build (3.3 / macos-latest)	19s
build (head / ubuntu-latest)	11s
build (head / macos-latest)	17s
build (truffleruby / ubuntu-latest)	22s
build (truffleruby / macos-latest)	23s
build (truffleruby-head / ubuntu-latest)	28s
build (truffleruby-head / macos-latest)	25s
	6m 23s

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