Remove ABI.Version.eventHandler(...) protocol requirement when the target does not support JSON event streaming.

Author: grynspan

Sources/Testing/ABI/ABI.swift

@@ -20,6 +20,7 @@ extension ABI {
     /// The numeric representation of this ABI version.
     static var versionNumber: Int { get }
 
+#if canImport(Foundation) && (!SWT_NO_FILE_IO || !SWT_NO_ABI_ENTRY_POINT)
     /// Create an event handler that encodes events as JSON and forwards them to
     /// an ABI-friendly event handler.
     ///
@@ -38,6 +39,7 @@ extension ABI {
       encodeAsJSONLines: Bool,
       forwardingTo eventHandler: @escaping @Sendable (_ recordJSON: UnsafeRawBufferPointer) -> Void
     ) -> Event.Handler
+#endif
   }
 
   /// The current supported ABI version (ignoring any experimental versions.)