Auto merge of rust-lang#95796 - bzEq:bzEq/curl-redirect, r=Dylan-DPC

[bootstrap.py] Instruct curl to follow redirect

Some mirror RUSTUP_DIST_SERVER (like https://mirrors.sjtug.sjtu.edu.cn/rust-static) perform redirection when downloading
stage0 compiler. Curl should be able to follow that.

src/bootstrap/bootstrap.py

@@ -122,6 +122,7 @@ def _download(path, url, probably_big, verbose, exception, help_on_error=None):
  option = "-s"
  require(["curl", "--version"])
  run(["curl", option,
+ "-L", # Follow redirect.
  "-y", "30", "-Y", "10", # timeout if speed is < 10 bytes/sec for > 30 seconds
  "--connect-timeout", "30", # timeout if cannot connect within 30 seconds
  "--retry", "3", "-Sf", "-o", path, url],