update libexec for pkgx^2 #373

Job	Run time
build (ubuntu-latest, linux, x86-64)	1m 20s
unavailable	17s
id	1m 18s
build (macos-latest, darwin, aarch64)	24s
test	23s
audit (macos-latest)	19s
test (darwin+aarch64)	17s
audit (ubuntu-latest)	23s
bottle (xz, linux+x86-64)	14s
bottle (xz, darwin+aarch64)	14s
bottle (gz, darwin+aarch64)	14s
bottle (gz, linux+x86-64)	16s
	5m 39s

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