481ca6166f
Unify `sysroot_target_{bin,lib}dir` handling
Follow-up to https://github.com/rust-lang/rust/pull/131405#discussion_r1826558962 where `sysroot_target_bindir` had to do some dancing because the sysroot ensure logic embedded in `sysroot_target_libdir` returned `$sysroot/$relative_lib/rustlib/$target/lib` and not the `rustlib` parent `$sysroot/$relative_lib/rustlib/`.
This PR pulls out the sysroot ensure logic into a helper, and return `$sysroot/$relative_lib/rustlib/` instead so `sysroot_target_bindir` doesn't have to do parent traversal from the path returned from `sysroot_target_libdir`, and also make them easier to follow in that they are now clearly closely related based on the common target sysroot ensure logic.
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