chore: checkpoint before Python removal

vendor/iana-time-zone/src/tz_aix.rs

@@ -0,0 +1,7 @@
+use std::env;
+use std::fs::OpenOptions;
+use std::io::{BufRead, BufReader};
+
+pub(crate) fn get_timezone_inner() -> Result<String, crate::GetTimezoneError> {
+    env::var("TZ").map_err(|_| crate::GetTimezoneError::OsError)
+}