opt-dist: set build_llvm to false for WindowsCi

suggested in #143898 (comment). see
#143898 (comment) as the reason for such test

Author: ognevny

src/tools/opt-dist/src/main.rs

@@ -206,7 +206,7 @@ fn create_environment(args: Args) -> anyhow::Result<(Environment, Vec<String>)>
                 .skipped_tests(vec![])
                 .run_tests(true)
                 .fast_try_build(is_fast_try_build)
-                .build_llvm(true)
+                .build_llvm(false)
                 .build()?;
 
             (env, shared.build_args)