update libexec for pkgx^2 #319

Job	Run time
unit-tests	27s
unavailable	16s
local-edit-tests	1m 18s
fix-machos.com (mac)	53s
git-clone.com (linux)	1m 28s
pyapp.com/poetry (linux)	1m 40s
toolchain.com (linux)	1m 26s
pc-cmake.com (linux)	1m 30s
stark.com/foo@1.2.3 (linux)	1m 30s
stark.com/foo (linux)	1m 27s
fix-machos.com (linux)	1m 27s
stark.com/foo (mac)	36s
fixups.org (linux)	1m 30s
git-clone.com (mac)	56s
version-transformer.com (linux)	1m 31s
pc-cmake.com (mac)	35s
pyapp.com/pip (mac)	58s
fixups.org (mac)	30s
pyapp.com/pip (linux)	1m 42s
toolchain.com (mac)	37s
version-transformer.com (mac)	27s
stark.com/foo@1.2.3 (mac)	42s
pyapp.com/poetry (mac)	52s
	24m 18s

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