Reduce the build time of the tests #3304
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Since linux-api doesn't rely on rustix and only adds some extra `From` impls between linux-api and rustix types, I think this would be better as a non-default feature.
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This feature doesn't seem to be needed anymore now that the standard library has a backtrace module. Enabling this feature pulls in the backtrace crate even though it's not needed. Backtraces are still supported when you use `RUST_BACKTRACE=1`.
To be more consistent.
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When building the tests we also build extra stuff that we don't need, for example the linux-api C bindings. This PR reduces the build time of the tests from 66 seconds to 42 seconds (207 compilation units to 150) when built with
./setup build --test, as documented in the report fromcargo build --timings. The next most problematic crates are the linux-api, vasi-sync, formatting-nostd/toml-edit, and neli crates due to their use of syn and related proc macros, but there's not much we can do about those.Partial graph of the time taken by the test crates after this PR: