deps: always define V8_EXPORT_PRIVATE as no-op

dllexport introduces issues when compiling with MSVC.

Author: targos

common.gypi

@@ -36,7 +36,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.3',
+    'v8_embedder_string': '-node.4',
 
     ##### V8 defaults for Node.js #####
 

deps/v8/src/base/macros.h

@@ -389,9 +389,9 @@ bool is_inbounds(float_t v) {
 
 // Setup for Windows shared library export.
 #ifdef BUILDING_V8_SHARED
-#define V8_EXPORT_PRIVATE __declspec(dllexport)
+#define V8_EXPORT_PRIVATE
 #elif USING_V8_SHARED
-#define V8_EXPORT_PRIVATE __declspec(dllimport)
+#define V8_EXPORT_PRIVATE
 #else
 #define V8_EXPORT_PRIVATE
 #endif  // BUILDING_V8_SHARED
@@ -401,7 +401,7 @@ bool is_inbounds(float_t v) {
 // Setup for Linux shared library export.
 #if V8_HAS_ATTRIBUTE_VISIBILITY
 #ifdef BUILDING_V8_SHARED
-#define V8_EXPORT_PRIVATE __attribute__((visibility("default")))
+#define V8_EXPORT_PRIVATE
 #else
 #define V8_EXPORT_PRIVATE
 #endif