Let a test run require the tools it must not skip

Nothing could make a missing prerequisite fail. A host without
pkg-config builds without Lua, and make test then passed with every
Lua test skipped and the lua pass of t0201 never run. The whole-script
skips become named prerequisites so the same list covers them, and the
strace probe now traces the file class of calls the tests use, so an
strace too old for it skips rather than fails.

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