[glibmm/std-string-msvc-fixes-2-66: 3/4] variantdbusstring.h: Drop GLIBMM_API decoration

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

commit 6613ee42b4788eeea4eda7a3568099c1b6dbb4a9
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Thu May 6 12:53:06 2021 +0800

    variantdbusstring.h: Drop GLIBMM_API decoration
    
    There is no API to export in the class definitions here, so just remove the
    GLIBMM_API decoration.  This will remove C4275 warnings from code including
    the header.

 glib/glibmm/variantdbusstring.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/glib/glibmm/variantdbusstring.h b/glib/glibmm/variantdbusstring.h
index ced63b8c..f6a6e75a 100644
--- a/glib/glibmm/variantdbusstring.h
+++ b/glib/glibmm/variantdbusstring.h
@@ -36,7 +36,7 @@ namespace Glib
  * @newin{2,54}
  * @ingroup Variant
 */
-class GLIBMM_API DBusObjectPathString : public Glib::ustring
+class DBusObjectPathString : public Glib::ustring
 {
 public:
   using Glib::ustring::ustring;
@@ -53,7 +53,7 @@ public:
  * @newin{2,54}
  * @ingroup Variant
 */
-class GLIBMM_API DBusSignatureString : public Glib::ustring
+class DBusSignatureString : public Glib::ustring
 {
 public:
   using Glib::ustring::ustring;