Auto merge of #30458 - fhahn:fix-warnings-tests-stdlib, r=sanxiyn

This PR siliences some warnings when compiling stdlib with --test. Mostly remove some unused imports and added a few `#[allow(..)]`.

I also marked some signal handling functions with `#[cfg(not(test))]`, because they are only called through `rt::lang_start`, which is also marked as  `#[cfg(not(test))]`

1 files changed, 3 insertions, 1 deletions

diff --git a/src/libstd/os/raw.rs b/src/libstd/os/raw.rs
index 17d6b2605c6..3bc063f4269 100644
--- a/src/libstd/os/raw.rs
+++ b/src/libstd/os/raw.rs
@@ -88,7 +88,8 @@ mod tests {
             c_longlong c_ulonglong c_float c_double);
     }
 
-    #[cfg(unix)]
+    #[cfg(all(unix, not(target_os = "android")))]
+    #[test]
     fn unix() {
         {
             use os::unix::raw;
@@ -101,6 +102,7 @@ mod tests {
     }
 
     #[cfg(windows)]
+    #[test]
     fn windows() {
         use os::windows::raw;
     }