[glibmm/glibmm-2-62] dbusconnection.ccg: Include giomm/unixfdlist.h on *NIX only

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 8efa48c31bf857f81c3a480d79b895b0a9df2d0e
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Mon Mar 2 16:33:47 2020 +0800

    dbusconnection.ccg: Include giomm/unixfdlist.h on *NIX only
    
    In Meson builds, we don't even generate giomm/unixfdlist.h unless we are
    building for *nix, and we aren't using the items there on non-*nix
    builds.

 gio/src/dbusconnection.ccg | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/gio/src/dbusconnection.ccg b/gio/src/dbusconnection.ccg
index de813fa0..e28e7b4d 100644
--- a/gio/src/dbusconnection.ccg
+++ b/gio/src/dbusconnection.ccg
@@ -22,7 +22,11 @@
 #include <giomm/dbusmethodinvocation.h>
 #include <giomm/dbuserror.h>
 #include <giomm/menumodel.h>
+
+#ifdef G_OS_UNIX
 #include <giomm/unixfdlist.h>
+#endif
+
 #include "slot_async.h"
 #include <mutex>