[glib] glib-mkenums: fix parsing of flags annotation

[Emmanuele Bassi <ebassi src gnome org>]

commit 8cc99502022944917f5dd78ce1d1427582081396
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Tue Aug 1 12:18:42 2017 +0300

    glib-mkenums: fix parsing of flags annotation
    
    https://bugzilla.gnome.org/show_bug.cgi?id=779332

 gobject/glib-mkenums.in |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/gobject/glib-mkenums.in b/gobject/glib-mkenums.in
index a82a374..d4bfd11 100755
--- a/gobject/glib-mkenums.in
+++ b/gobject/glib-mkenums.in
@@ -450,6 +450,11 @@ def process_file(curfilename):
                     continue
                 enum_prefix = options.get('prefix', None)
                 flags = options.get('flags', None)
+                if 'flags' in options:
+                    if flags is None:
+                        flags = 1
+                    else:
+                        flags = int(flags)
                 option_lowercase_name = options.get('lowercase_name', None)
                 option_underscore_name = options.get('underscore_name', None)
             else: