Refine tests

Author: tgross35

testcrate/build.rs

@@ -1,4 +1,3 @@
-#![allow(unused)]
 use std::{collections::HashSet, env};
 
 /// Features to enable
@@ -24,7 +23,6 @@ fn main() {
         || target.contains("windows-gnu")
         // FIXME(llvm): There is an ABI incompatibility between GCC and Clang on 32-bit x86.
         // See <https://github.com/llvm/llvm-project/issues/77401>.
-        || target.starts_with("i586")
         || target.starts_with("i686")
         // 32-bit PowerPC and 64-bit LE gets code generated that Qemu cannot handle. See
         // <https://github.com/rust-lang/compiler-builtins/pull/606#issuecomment-2105635926>.