Rollup merge of #85762 - mati865:disable-zlib-on-windows, r=Mark-Simulacrum
Rollup merge of #85762 - mati865:disable-zlib-on-windows, r=Mark-Simulacrum

Do not try to build LLVM with Zlib on Windows

Fixes https://github.com/rust-lang/rust/issues/85422
Fixes https://github.com/rust-lang/rust/issues/85624

We do not install Zlib on the CI but recent builds somehow started picking it's shared version.
To avoid relying on CI binaries so let's explicitly disable it.

graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust