pythongh-88267: Avoid exporting functions when a static build is used (Windows-only)

Author: lakor64

Include/exports.h

@@ -2,9 +2,15 @@
 #define Py_EXPORTS_H
 
 #if defined(_WIN32) || defined(__CYGWIN__)
-    #define Py_IMPORTED_SYMBOL __declspec(dllimport)
-    #define Py_EXPORTED_SYMBOL __declspec(dllexport)
-    #define Py_LOCAL_SYMBOL
+    #if defined(Py_ENABLE_SHARED)
+        #define Py_IMPORTED_SYMBOL __declspec(dllimport)
+        #define Py_EXPORTED_SYMBOL __declspec(dllexport)
+        #define Py_LOCAL_SYMBOL
+    #else
+        #define Py_IMPORTED_SYMBOL
+        #define Py_EXPORTED_SYMBOL
+        #define Py_LOCAL_SYMBOL
+    #endif
 #else
 /*
  * If we only ever used gcc >= 5, we could use __has_attribute(visibility)