[libadwaita/msvc] adw-settings.c: Skip init'ing portal on Windows

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

commit c7c73c77e460416386869178adb8a73e36187bbe
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Tue Oct 12 16:08:08 2021 +0800

    adw-settings.c: Skip init'ing portal on Windows
    
    FreeDesktop Portal/FlatPak is not and will likely not be available for Windows

 src/adw-settings.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/adw-settings.c b/src/adw-settings.c
index 417e7db5..2b9b2c4b 100644
--- a/src/adw-settings.c
+++ b/src/adw-settings.c
@@ -421,7 +421,9 @@ adw_settings_constructed (GObject *object)
 
   G_OBJECT_CLASS (adw_settings_parent_class)->constructed (object);
 
+#ifdef G_OS_WIN32
   init_portal (self);
+#endif
 
   if (!self->has_color_scheme || !self->has_high_contrast)
     init_gsettings (self);