gvc++: [nfc] align storage-class declarations to Graphviz standard in GVLayout.h

diff --git a/lib/gvc++/GVLayout.h b/lib/gvc++/GVLayout.h
index 9de45440b4c148dca7eb35328c72add980418522..defe72efee1b3ef5b44fb6734f759d8acdc215c0 100644 (file)
--- a/lib/gvc++/GVLayout.h
+++ b/lib/gvc++/GVLayout.h
@@ -12,7 +12,9 @@
 #else
 #define GVLAYOUT_API __declspec(dllimport)
 #endif
-#else
+#endif
+
+#ifndef GVLAYOUT_API
 #define GVLAYOUT_API /* nothing */
 #endif