[libsoup/wip/tpopela/negotiate] soup-auth: Correctly mark the soup_auth_negotiate_supported variable

[Tomas Popela <tpopela src gnome org>]

commit a0d26748697699f566084a6aaf875a05277b3926
Author: Tomas Popela <tpopela redhat com>
Date:   Thu Feb 18 12:34:53 2016 +0100

    soup-auth: Correctly mark the soup_auth_negotiate_supported variable

 libsoup/soup-auth.h |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/libsoup/soup-auth.h b/libsoup/soup-auth.h
index cd70f23..7c56e67 100644
--- a/libsoup/soup-auth.h
+++ b/libsoup/soup-auth.h
@@ -138,7 +138,8 @@ void        soup_auth_has_saved_password (SoupAuth   *auth,
                                          const char *username,
                                          const char *password);
 
-extern const gboolean soup_auth_negotiate_supported;
+SOUP_AVAILABLE_IN_2_54
+const gboolean soup_auth_negotiate_supported;
 
 G_END_DECLS