[goocanvas/prep-msvc-3.0: 3/4] src/goocanvasatk.c: Add prototypes for MSVC builds

[Chun-wei Fan <fanchunwei src gnome org>]

commit 14e0593009ddffb017ac7231c29b05d475cba95d
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Sat Jun 12 12:16:53 2021 +0800

    src/goocanvasatk.c: Add prototypes for MSVC builds
    
    This way, the compiler can pick up the __declspec(dllexport) directives during
    the build on Visual Studio.  The symbols here are needed for building the
    introspection files.

 src/goocanvasatk.c | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/src/goocanvasatk.c b/src/goocanvasatk.c
index 565f1bc..fba0d1c 100644
--- a/src/goocanvasatk.c
+++ b/src/goocanvasatk.c
@@ -12,6 +12,15 @@
 #include <gtk/gtk.h>
 #include "goocanvas.h"
 
+#ifdef _MSC_VER
+GOOCANVAS_API extern
+GType    goo_canvas_accessible_factory_get_type  (void) G_GNUC_CONST;
+GOOCANVAS_API extern
+GType    goo_canvas_item_accessible_factory_get_type  (void) G_GNUC_CONST;
+GOOCANVAS_API extern
+GType    goo_canvas_widget_accessible_factory_get_type  (void) G_GNUC_CONST;
+#endif
+
 
 /*
  * GooCanvasItemAccessible.