tighten up libtool fixup; add tests and skip keys #364

Job	Run time
build (ubuntu-latest, linux, x86-64)	1m 7s
unavailable	30s
build (macos-latest, darwin, aarch64)	41s
id	1m 39s
test	27s
audit (ubuntu-latest)	24s
bottle (xz, darwin+aarch64)	19s
test (darwin+aarch64)	30s
audit (macos-latest)	26s
bottle (gz, darwin+aarch64)	20s
bottle (xz, linux+x86-64)	22s
bottle (gz, linux+x86-64)	20s
	7m 5s

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