neato_layout: use GVDLL instead _WIN32 to control storage-class attributes

Storage-class attributes should only be used for dynamic-link
libraries, but not for statically linked libraries.

Towards https://gitlab.com/graphviz/graphviz/-/issues/2058

diff --git a/plugin/neato_layout/gvplugin_neato_layout.c b/plugin/neato_layout/gvplugin_neato_layout.c
index f240542416fff4b2f251a2ae4239203ea4779fb3..13f3aeda1231c3b78f9d4e9d1f6df01a88e96beb 100644 (file)
--- a/plugin/neato_layout/gvplugin_neato_layout.c
+++ b/plugin/neato_layout/gvplugin_neato_layout.c
@@ -8,6 +8,8 @@
  * Contributors: Details at https://graphviz.org
  *************************************************************************/
 
+#include "config.h"
+
 #include <gvc/gvplugin.h>
 
 extern gvplugin_installed_t gvlayout_neato_types[];
@@ -17,7 +19,7 @@ static gvplugin_api_t apis[] = {
     {(api_t)0, 0},
 };
 
-#ifdef _WIN32
+#ifdef GVDLL
 #   define GVPLUGIN_NEATO_LAYOUT_API __declspec(dllexport)
 #else
 #   define GVPLUGIN_NEATO_LAYOUT_API