update libexec for pkgx^2 #325

Job	Run time
unit-tests	23s
unavailable	19s
local-edit-tests	19s
stark.com/foo (linux)	1m 30s
toolchain.com (linux)	1m 43s
pyapp.com/poetry (linux)	1m 47s
pyapp.com/pip (linux)	1m 53s
pc-cmake.com (linux)	1m 38s
fix-machos.com (linux)	1m 32s
git-clone.com (linux)	1m 36s
fixups.org (linux)	1m 37s
version-transformer.com (linux)	1m 41s
stark.com/foo@1.2.3 (linux)	1m 37s
pyapp.com/pip (mac)	48s
version-transformer.com (mac)	39s
fix-machos.com (mac)	38s
pc-cmake.com (mac)	37s
toolchain.com (mac)	35s
stark.com/foo@1.2.3 (mac)	31s
fixups.org (mac)	22s
git-clone.com (mac)	33s
pyapp.com/poetry (mac)	1m 39s
stark.com/foo (mac)	26s
	24m 23s

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