update libexec for pkgx^2 #322

Job	Run time
unit-tests	8s
unavailable	20s
local-edit-tests	22s
stark.com/foo@1.2.3 (linux)	14s
pc-cmake.com (mac)	33s
toolchain.com (linux)	14s
pc-cmake.com (linux)	9s
stark.com/foo (linux)	11s
pyapp.com/pip (linux)	10s
pyapp.com/pip (mac)	42s
git-clone.com (linux)	14s
toolchain.com (mac)	43s
fix-machos.com (linux)	12s
stark.com/foo@1.2.3 (mac)	35s
fixups.org (mac)	41s
stark.com/foo (mac)	39s
fixups.org (linux)	9s
git-clone.com (mac)	34s
pyapp.com/poetry (linux)	14s
version-transformer.com (mac)	32s
fix-machos.com (mac)	37s
pyapp.com/poetry (mac)	1m 7s
version-transformer.com (linux)	14s
	9m 34s

Provide feedback