update libexec for pkgx^2 #368

Job	Run time
id	1m 34s
build (macos-latest, darwin, aarch64)	34s
build (ubuntu-latest, linux, x86-64)	1m 20s
unavailable	16s
test (darwin+aarch64)	17s
audit (ubuntu-latest)	17s
bottle (xz, linux+x86-64)	13s
bottle (gz, darwin+aarch64)	17s
bottle (gz, linux+x86-64)	14s
audit (macos-latest)	18s
bottle (xz, darwin+aarch64)	16s
test	19s
	5m 55s

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