[glib] goption: Add G_OPTION_FLAG_NONE

[Ryan Lortie <desrt src gnome org>]

commit 8061694c496094015bfd3959cbece7ab158ef6ef
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Tue Sep 16 15:39:59 2014 -0600

    goption: Add G_OPTION_FLAG_NONE
    
    This is helpful to better document code, as G_OPTION_FLAG_NONE is more
    readable than 0.

 glib/goption.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/glib/goption.h b/glib/goption.h
index 9e9ca1a..ab12a27 100644
--- a/glib/goption.h
+++ b/glib/goption.h
@@ -53,6 +53,7 @@ typedef struct _GOptionEntry   GOptionEntry;
 
 /**
  * GOptionFlags:
+ * @G_OPTION_FLAG_NONE: No flags. Since: 2.42.
  * @G_OPTION_FLAG_HIDDEN: The option doesn't appear in `--help` output.
  * @G_OPTION_FLAG_IN_MAIN: The option appears in the main section of the
  *     `--help` output, even if it is defined in a group.
@@ -79,6 +80,7 @@ typedef struct _GOptionEntry   GOptionEntry;
  */
 typedef enum
 {
+  G_OPTION_FLAG_NONE            = 0,
   G_OPTION_FLAG_HIDDEN         = 1 << 0,
   G_OPTION_FLAG_IN_MAIN                = 1 << 1,
   G_OPTION_FLAG_REVERSE                = 1 << 2,