Fix import/export annotations for v8 targets that are always static

include/v8.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /** \mainpage V8 API Reference Guide
  *
  * V8 is Google's open source JavaScript engine.
  *
  * This set of documents provides reference material generated from the
  * V8 header file, include/v8.h.
@@ skipping 17 matching lines @@
 // We reserve the V8_* prefix for macros defined in V8 public API and
 // assume there are no name conflicts with the embedder's code.
 
 #ifdef V8_OS_WIN
 
 // Setup for Windows DLL export/import. When building the V8 DLL the
 // BUILDING_V8_SHARED needs to be defined. When building a program which uses
 // the V8 DLL USING_V8_SHARED needs to be defined. When either building the V8
 // static library or building a program which uses the V8 static library neither
 // BUILDING_V8_SHARED nor USING_V8_SHARED should be defined.
-#if defined(BUILDING_V8_SHARED) && defined(USING_V8_SHARED)
-#error both BUILDING_V8_SHARED and USING_V8_SHARED are set - please check the\
-  build configuration to ensure that at most one of these is set
-#endif
-
 #ifdef BUILDING_V8_SHARED
 # define V8_EXPORT __declspec(dllexport)
 #elif USING_V8_SHARED
 # define V8_EXPORT __declspec(dllimport)
 #else
 # define V8_EXPORT
 #endif  // BUILDING_V8_SHARED
 
 #else  // V8_OS_WIN
 
@@ skipping 9617 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // INCLUDE_V8_H_