Auto merge of #102543 - daym:patch-1, r=joshtriplett

Remove "execute" bit from lock file permissions

Previously, flock would set the "execute" bit on Rust lock files. That makes no sense.

This patch clears the "execute" bit on Rust lock files.

See issue #102531.

compiler/rustc_data_structures/src/flock/linux.rs

@@ -14,12 +14,7 @@ pub struct Lock {
 
 impl Lock {
     pub fn new(p: &Path, wait: bool, create: bool, exclusive: bool) -> io::Result<Lock> {
-        let file = OpenOptions::new()
-            .read(true)
-            .write(true)
-            .create(create)
-            .mode(libc::S_IRWXU as u32)
-            .open(p)?;
+        let file = OpenOptions::new().read(true).write(true).create(create).mode(0o600).open(p)?;
 
         let mut operation = if exclusive { libc::LOCK_EX } else { libc::LOCK_SH };
         if !wait {