eina: fixup EAPI definition.

src/lib/eina/eina_internal.h

@@ -1,5 +1,5 @@
 #ifndef EINA_INTERNAL_H
-#define EINA_INTERNAL_H
+# define EINA_INTERNAL_H
 
 /*
  * eina_internal.h
@@ -8,9 +8,49 @@
  * not stable API.
  */
 
+#ifdef EAPI
+# undef EAPI
+#endif
+
+#ifdef _WIN32
+# ifdef EFL_EINA_BUILD
+#  ifdef DLL_EXPORT
+#   define EAPI __declspec(dllexport)
+#  else
+#   define EAPI
+#  endif /* ! DLL_EXPORT */
+# else
+#  define EAPI __declspec(dllimport)
+# endif /* ! EFL_EINA_BUILD */
+# define EAPI_WEAK
+#else
+# ifdef __GNUC__
+#  if __GNUC__ >= 4
+#   define EAPI __attribute__ ((visibility("default")))
+#   define EAPI_WEAK __attribute__ ((weak))
+#  else
+#   define EAPI
+#   define EAPI_WEAK
+#  endif
+# else
+/**
+ * @def EAPI
+ * @brief Used to export functions (by changing visibility).
+ */
+#  define EAPI
+# endif
+#endif
+
 /**
  * @brief Cancels all pending promise/futures.
+ *
+ * Internal function. Do not use.
+ *
+ * @internal
  */
 EAPI void __eina_promise_cancel_all(void);
 
+#undef EAPI
+#define EAPI
+
 #endif