11365: Add a way to disable dll copying for users of proc_macro_srv library r=lnicola a=vlad20012 We use `ra_ap_proc_macro_srv` library in IntelliJ Rust in order to expand proc macros. We need a way to disable [DLL copying to a temp dir on Windows](https://github.com/rust-analyzer/rust-analyzer/blob/master/crates/proc_macro_srv/src/dylib.rs#L166) behavior because it causes issues like https://github.com/intellij-rust/intellij-rust/issues/7709. Unlike RA, file locking is not an issue for IntelliJ Rust because we copy DLLs to a temp dir before calling the expander. Co-authored-by: vlad20012 <beskvlad@gmail.com>
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