Revert "deps: always define V8_EXPORT_PRIVATE as no-op"

This reverts commit ffadf35.

PR-URL: #58187
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: targos

common.gypi

@@ -38,7 +38,7 @@
 
     # 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.11',
+    'v8_embedder_string': '-node.12',
 
     ##### V8 defaults for Node.js #####
 

deps/v8/src/base/macros.h

@@ -442,9 +442,9 @@ bool is_inbounds(float_t v) {
 // Setup for Windows shared library export.
 #define V8_EXPORT_ENUM
 #ifdef BUILDING_V8_SHARED_PRIVATE
-#define V8_EXPORT_PRIVATE
+#define V8_EXPORT_PRIVATE __declspec(dllexport)
 #elif USING_V8_SHARED_PRIVATE
-#define V8_EXPORT_PRIVATE
+#define V8_EXPORT_PRIVATE __declspec(dllimport)
 #else
 #define V8_EXPORT_PRIVATE
 #endif  // BUILDING_V8_SHARED
@@ -454,7 +454,7 @@ bool is_inbounds(float_t v) {
 // Setup for Linux shared library export.
 #if V8_HAS_ATTRIBUTE_VISIBILITY && \
     (defined(BUILDING_V8_SHARED_PRIVATE) || USING_V8_SHARED_PRIVATE)
-#define V8_EXPORT_PRIVATE
+#define V8_EXPORT_PRIVATE __attribute__((visibility("default")))
 #define V8_EXPORT_ENUM V8_EXPORT_PRIVATE
 #else
 #define V8_EXPORT_PRIVATE