SYSTEM_DEFAULT_CONNECT_POINT si not found for windows and behind a unix flag

Summary

Building arti from source

Steps to reproduce:

1. Clone the current main(hash:95762c14)
2. Run a release build in windows 11

What is the current bug behavior?

tor_rpc_connect does not build correctly failing with SYSTEM_DEFAULT_CONNECT_POINT is not found and being help behind an item which is gated behind unix flag.

What is the expected behavior?

tor_rpc_connect builds correctly allowing the package to compile

Environment

• Version: cargo 1.83.0 (5ffbef321 2024-10-29), rustc 1.83.0 (90b35a623 2024-11-26)
• Operating system: Windows 11 24H2
• Install method: from git master from source
• etc...

Relevant logs and/or screenshots:

   Compiling arti-rpc-client-core v0.25.0 (C:\Users\Ahadl\Documents\GitHub\arti\crates\arti-rpc-client-core)                                                                                                              
error[E0425]: cannot find value `SYSTEM_DEFAULT_CONNECT_POINT` in crate `tor_rpc_connect`                                                                                                                                 
   --> crates\arti-rpc-client-core\src\conn\builder.rs:121:43
    |
121 |         if let Some(p) = tor_rpc_connect::SYSTEM_DEFAULT_CONNECT_POINT {
    |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: a constant with a similar name exists: `USER_DEFAULT_CONNECT_POINT`
    |
   ::: C:\Users\Ahadl\Documents\GitHub\arti\crates\tor-rpc-connect\src\lib.rs:231:1
    |
231 | pub const USER_DEFAULT_CONNECT_POINT: &str = {
    | ------------------------------------------ similarly named constant `USER_DEFAULT_CONNECT_POINT` defined here
    |
note: found an item that was configured out
   --> C:\Users\Ahadl\Documents\GitHub\arti\crates\tor-rpc-connect\src\lib.rs:254:11
    |
254 | pub const SYSTEM_DEFAULT_CONNECT_POINT: Option<&str> = {
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: the item is gated here
   --> C:\Users\Ahadl\Documents\GitHub\arti\crates\tor-rpc-connect\src\lib.rs:253:1
    |
253 | #[cfg(unix)]
    | ^^^^^^^^^^^^

   Compiling zstd v0.13.2                                                                                                                                                                                                 
   Compiling tor-ptmgr v0.25.0 (C:\Users\Ahadl\Documents\GitHub\arti\crates\tor-ptmgr)
For more information about this error, try `rustc --explain E0425`.                                                                                                                                                       
error: could not compile `arti-rpc-client-core` (lib) due to 1 previous error
warning: build failed, waiting for other jobs to finish...

Possible fixes:

Remove the unix cfg requirement in tor_rpc_connect