[gtk/debug-envvars-cleanup] Fixup __VA_ARGS__

[Matthias Clasen <matthiasc src gnome org>]

commit bf6da2d856b1055c49bbf3054c3226b147b9318c
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Sep 23 15:22:26 2022 -0400

    Fixup __VA_ARGS__
    
    __VA_OPT__ doesn't work with clang on macos, so
    try the GNU ## extension.

 gdk/gdkdebug.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gdk/gdkdebug.h b/gdk/gdkdebug.h
index b888d2c1fd..94cc26aa6e 100644
--- a/gdk/gdkdebug.h
+++ b/gdk/gdkdebug.h
@@ -59,7 +59,7 @@ GdkDebugFlags    gdk_display_get_debug_flags    (GdkDisplay       *display);
 void             gdk_display_set_debug_flags    (GdkDisplay       *display,
                                                  GdkDebugFlags     flags);
 
-#define gdk_debug_message(format, ...) g_fprintf (stderr, format "\n" __VA_OPT__(,) __VA_ARGS__)
+#define gdk_debug_message(format, ...) g_fprintf (stderr, format "\n", ##__VA_ARGS__)
 
 #ifdef G_ENABLE_DEBUG