RENAME: accept .a ↔ .lib when the canonical archive is missing #88

Job	Run time
consumer (windows-latest, msvc)	58s
harness (ubuntu-latest, gcc)	1m 7s
harness (windows-latest, msvc)	2m 32s
consumer (macos-latest, clang)	29s
consumer (ubuntu-latest, gcc)	38s
harness (macos-latest, clang)	1m 3s
	6m 47s

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