update libexec for pkgx^2 #372

Job	Run time
build (ubuntu-latest, linux, x86-64)	1m 18s
unavailable	18s
id	1m 23s
build (macos-latest, darwin, aarch64)	38s
audit (ubuntu-latest)	17s
audit (macos-latest)	17s
test	15s
test (darwin+aarch64)	19s
bottle (xz, linux+x86-64)	12s
bottle (xz, darwin+aarch64)	13s
bottle (gz, linux+x86-64)	12s
bottle (gz, darwin+aarch64)	18s
	5m 40s

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