Revert "Merge pull request #916 from tshortli/fix-wasi-build"

This reverts commit 9042721, reversing
changes made to dfa0d24.

Author: grynspan

Sources/Testing/Discovery.swift

@@ -86,13 +86,8 @@ struct TestContentRecord<T>: Sendable where T: ~Copyable {
   ///   with interfaces such as `dlsym()` that expect such a pointer.
 #if SWT_NO_DYNAMIC_LINKING
   @available(*, unavailable, message: "Image addresses are not available on this platform.")
-  nonisolated(unsafe) var imageAddress: UnsafeRawPointer? {
-    get { fatalError() }
-    set { fatalError() }
-  }
-#else
-  nonisolated(unsafe) var imageAddress: UnsafeRawPointer?
 #endif
+  nonisolated(unsafe) var imageAddress: UnsafeRawPointer?
 
   /// The underlying test content record loaded from a metadata section.
   private var _record: __TestContentRecord