update libexec for pkgx^2 #317

Job	Run time
unit-tests	22s
unavailable	21s
local-edit-tests	1m 24s
version-transformer.com (linux)	1m 19s
pc-cmake.com (mac)	48s
pyapp.com/pip (linux)	1m 38s
git-clone.com (linux)	1m 20s
pyapp.com/pip (mac)	1m 8s
stark.com/foo@1.2.3 (linux)	1m 25s
pyapp.com/poetry (mac)	1m 6s
stark.com/foo@1.2.3 (mac)	49s
fix-machos.com (linux)	1m 14s
toolchain.com (mac)	1m 4s
stark.com/foo (linux)	1m 27s
git-clone.com (mac)	54s
stark.com/foo (mac)	46s
fix-machos.com (mac)	1m 0s
fixups.org (mac)	59s
pyapp.com/poetry (linux)	1m 39s
toolchain.com (linux)	1m 21s
fixups.org (linux)	1m 25s
pc-cmake.com (linux)	1m 21s
version-transformer.com (mac)	46s
	25m 36s

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