Auto merge of #102018 - pietroalbini:pa-1.64.0, r=pietroalbini 1.64.0

[stable] Prepare 1.64.0 release

This PR prepares the 1.64.0 stable release builds.

In addition to bumping the channel and including the latest release notes changes, this PR also backports the following PRs:

*  #100852
*  #101366
*  #101468
*  #101922

This PR also reverts the following PRs, as decided in https://github.com/rust-lang/rust/issues/101899#issuecomment-1250996783:

* https://github.com/rust-lang/rust/pull/95295
* https://github.com/rust-lang/rust/pull/99136 (followup to the previous PR)

r? `@ghost`
cc `@rust-lang/release`

1 files changed, 9 insertions, 4 deletions

diff --git a/src/bootstrap/lib.rs b/src/bootstrap/lib.rs
index f84de73297a..d265277b406 100644
--- a/src/bootstrap/lib.rs
+++ b/src/bootstrap/lib.rs
@@ -396,13 +396,18 @@ impl Build {
         let src = config.src.clone();
         let out = config.out.clone();
 
+        #[cfg(unix)]
+        // keep this consistent with the equivalent check in x.py:
+        // https://github.com/rust-lang/rust/blob/a8a33cf27166d3eabaffc58ed3799e054af3b0c6/src/bootstrap/bootstrap.py#L796-L797
         let is_sudo = match env::var_os("SUDO_USER") {
-            Some(sudo_user) => match env::var_os("USER") {
-                Some(user) => user != sudo_user,
-                None => false,
-            },
+            Some(_sudo_user) => {
+                let uid = unsafe { libc::getuid() };
+                uid == 0
+            }
             None => false,
         };
+        #[cfg(not(unix))]
+        let is_sudo = false;
 
         let ignore_git = config.ignore_git;
         let rust_info = channel::GitInfo::new(ignore_git, &src);