Auto merge of rust-lang#140273 - matthiaskrgr:rollup-rxmuvkg, r=matthiaskrgr

Rollup of 8 pull requests

Successful merges:

 - rust-lang#137096 (Stabilize flags for doctest cross compilation)
 - rust-lang#140148 (CI: use aws codebuild for job dist-arm-linux)
 - rust-lang#140187 ([AIX] Handle AIX dynamic library extensions within c-link-to-rust-dylib run-make test)
 - rust-lang#140196 (Improved diagnostics for non-primitive cast on non-primitive types (`Arc`, `Option`))
 - rust-lang#140210 (Work around cygwin issue on condvar timeout)
 - rust-lang#140213 (mention about `x.py setup` in `INSTALL.md`)
 - rust-lang#140229 (`DelimArgs` tweaks)
 - rust-lang#140248 (Fix impl block items indent)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

std/src/sys/pal/unix/sync/condvar.rs

@@ -64,7 +64,10 @@ impl Condvar {
         // https://gist.github.com/stepancheg/198db4623a20aad2ad7cddb8fda4a63c
         //
         // To work around this issue, the timeout is clamped to 1000 years.
-        #[cfg(target_vendor = "apple")]
+        //
+        // Cygwin implementation is based on NT API and a super large timeout
+        // makes the syscall block forever.
+        #[cfg(any(target_vendor = "apple", target_os = "cygwin"))]
         let dur = Duration::min(dur, Duration::from_secs(1000 * 365 * 86400));
 
         let timeout = Timespec::now(Self::CLOCK).checked_add_duration(&dur);