ssh: support BindAddress

This is already supported by libssh_rs.

docs/ssh.md

@@ -41,6 +41,7 @@ and respects the following options:
 * `Host` (including wildcard matching)
 * `UserKnownHostsFile`
 * `IdentitiesOnly`
+* `BindAddress`
 
 All other options are parsed but have no effect.  Notably, neither `Match` or
 `Include` will do anything.

wezterm-ssh/src/sessioninner.rs

@@ -196,6 +196,9 @@ impl SessionInner {
                 types.to_string(),
             ))?;
         }
+        if let Some(bind_addr) = self.config.get("bindaddress") {
+            sess.set_option(libssh_rs::SshOption::BindAddress(bind_addr.to_string()))?;
+        }
 
         sess.connect()?;