plugin/gdiplus: use GVDLL instead of _WIN32 to enable dllexport storage-class attribu...

Towards https://gitlab.com/graphviz/graphviz/-/issues/2173.

diff --git a/plugin/gdiplus/gvplugin_gdiplus.cpp b/plugin/gdiplus/gvplugin_gdiplus.cpp
index 519dc0fd46f98cc05e2868a938df966c08026604..57860e3d8c125708fcee5564ea2a5ec99b294429 100644 (file)
--- a/plugin/gdiplus/gvplugin_gdiplus.cpp
+++ b/plugin/gdiplus/gvplugin_gdiplus.cpp
@@ -90,7 +90,7 @@ static gvplugin_api_t apis[] = {
 extern "C" {
 #endif
 
-#ifdef _WIN32
+#ifdef GVDLL
 #define GVPLUGIN_GDIPLUS_API __declspec(dllexport)
 #else
 #define GVPLUGIN_GDIPLUS_API