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rustc_llvm: Link to `zlib` on dragonfly and solaris On native builds `llvm-config` picks up `zlib` and this gets pased into the rust build tools, but on cross builds `llvm-config` is explicitly ignored as it contains information for the host system and cannot be trusted to be accurate for the target system. Both DragonFly and Solaris contain `zlib` in the base system, so this is both a safe assumption and required for a successful cross build unless `zlib` support is disabled in LLVM. This is more or less in the same vein as rust-lang#75713 and rust-lang#75655.