[glibmm/msvc.fix.symbol] glib/src/binding.hg: Export Glib::manage()

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

commit c11657165b2413ce0096278148421f958fc197a9
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Wed Mar 3 16:26:45 2021 +0800

    glib/src/binding.hg: Export Glib::manage()
    
    The newly-added function was missing a GLIBMM_API annotation, causing this
    function not to be exported.  Fixes build of the glibmm binding test
    program on Visual Studio-style builds.

 glib/src/binding.hg | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/glib/src/binding.hg b/glib/src/binding.hg
index dd4054fd..afddd669 100644
--- a/glib/src/binding.hg
+++ b/glib/src/binding.hg
@@ -547,6 +547,7 @@ private:
  * @param binding The Glib::Binding to set as managed, or an empty Glib::RefPtr.
  * @return The same Glib::Binding or empty Glib::RefPtr.
  */
+GLIBMM_API
 const Glib::RefPtr<Glib::Binding>& manage(const Glib::RefPtr<Glib::Binding>& binding);
 
 } // namespace Glib