Rollup merge of rust-lang#62752 - nikic:llvm-disable-z3, r=alexcrichton

Disable Z3 in LLVM build

Avoid building LLVM with Z3 if it happens to be installed.

Fixes rust-lang#62750.

r? @alexcrichton

src/bootstrap/native.rs

@@ -150,6 +150,7 @@ impl Step for Llvm {
            .define("WITH_POLLY", "OFF")
            .define("LLVM_ENABLE_TERMINFO", "OFF")
            .define("LLVM_ENABLE_LIBEDIT", "OFF")
+           .define("LLVM_ENABLE_Z3_SOLVER", "OFF")
            .define("LLVM_PARALLEL_COMPILE_JOBS", builder.jobs().to_string())
            .define("LLVM_TARGET_ARCH", target.split('-').next().unwrap())
            .define("LLVM_DEFAULT_TARGET_TRIPLE", target);