[seed] Publicly export seed_exception_get_stack

[Alan Knowles <alank src gnome org>]

commit 430a457e3e29eacdb2f93bcd234545fad6191fe6
Author: Emilio Pozuelo Monfort <emilio pozuelo collabora co uk>
Date:   Wed Jun 12 15:39:12 2013 +0200

    Publicly export seed_exception_get_stack
    
    It is documented as a public function and exposed in the ABI,
    but not exported in the public headers.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=702090

 libseed/seed.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/libseed/seed.h b/libseed/seed.h
index 0485f84..defdef4 100644
--- a/libseed/seed.h
+++ b/libseed/seed.h
@@ -106,6 +106,7 @@ gchar *seed_exception_get_name (SeedContext ctx, SeedException exception);
 gchar *seed_exception_get_message (SeedContext ctx, SeedException exception);
 guint seed_exception_get_line (SeedContext ctx, SeedException exception);
 gchar *seed_exception_get_file (SeedContext ctx, SeedException exception);
+gchar *seed_exception_get_stack (SeedContext ctx, SeedException exception);
 gchar *seed_exception_to_string (SeedContext ctx, SeedException exception);
 
 SeedValue seed_evaluate (SeedContext ctx, SeedScript * s, SeedObject this_object);