tighten up libtool fixup; add tests and skip keys #314

Job	Run time
unit-tests	23s
unavailable	19s
local-edit-tests	1m 32s
version-transformer.com (linux)	1m 24s
pyapp.com/pip (mac)	53s
pyapp.com/pip (linux)	1m 32s
pc-cmake.com (linux)	1m 20s
fix-machos.com (linux)	1m 19s
pyapp.com/poetry (linux)	1m 41s
git-clone.com (mac)	40s
fix-machos.com (mac)	1m 4s
pc-cmake.com (mac)	44s
stark.com/foo@1.2.3 (linux)	1m 17s
stark.com/foo@1.2.3 (mac)	30s
pyapp.com/poetry (mac)	1m 9s
toolchain.com (mac)	51s
toolchain.com (linux)	1m 31s
stark.com/foo (linux)	1m 28s
version-transformer.com (mac)	44s
git-clone.com (linux)	1m 32s
stark.com/foo (mac)	46s
	22m 39s

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