8329958: Windows x86 build fails: downcallLinker.cpp(36) redefinition

Reviewed-by: kvn, shade

Author: David Holmes

src/hotspot/share/prims/downcallLinker.hpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2020, 2024, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -41,7 +41,8 @@ class DowncallLinker: AllStatic {
                                          int captured_state_mask,
                                          bool needs_transition);
 
-  static void capture_state(int32_t* value_ptr, int captured_state_mask);
+  // This is defined as JVM_LEAF which adds the JNICALL modifier.
+  static void JNICALL capture_state(int32_t* value_ptr, int captured_state_mask);
 
   class StubGenerator : public StubCodeGenerator {
     BasicType* _signature;