Fails with  **note, vcpkg did not find zlib: the vcpkg-rs Vcpkg build helper can only find libraries built for the MSVC ABI.**  when building for -gnu and all MSYS2 libraries are present?

Downstream bug: https://github.com/nabijaczleweli/cargo-update/issues/307

See triage inside. The most obvious difference between my otherwise-equivalent config is I'm on Windows 10 and don't have vcpkg.