[libunwind] libunwind: Remove OS requirements from tests to make them run on more OSes (PR #167642)

[Alexander Richardson via cfe-commits]

================
@@ -7,7 +7,10 @@
 //
 //===----------------------------------------------------------------------===//
 
-// REQUIRES: linux
+// UNSUPPORTED: system-windows
+// UNSUPPORTED: target={{.*}}-darwin{{.*}}
+// UNSUPPORTED: target={{.*}}-aix{{.*}}
+// UNSUPPORTED: target={{.*-windows-gnu}}
----------------
arichardson wrote:

```suggestion
// UNSUPPORTED: target={{.*-apple.*}}
// UNSUPPORTED: target={{.*-aix.*}}
// UNSUPPORTED: target={{.*-windows.*}}
```

https://github.com/llvm/llvm-project/pull/167642