update libexec for pkgx^2 #376

Job	Run time
id	1m 22s
build (macos-latest, darwin, aarch64)	47s
unavailable	15s
build (ubuntu-latest, linux, x86-64)	1m 17s
test (darwin+aarch64)	28s
bottle (gz, darwin+aarch64)	25s
bottle (xz, darwin+aarch64)	37s
audit (macos-latest)	38s
test	31s
bottle (xz, linux+x86-64)	33s
bottle (gz, linux+x86-64)	26s
audit (ubuntu-latest)	21s
	7m 40s

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