[glib] Export __glib_assert_msg

[Matthias Clasen <matthiasc src gnome org>]

commit e70250bbd5e786240fee7ad373ee16657518acf7
Author: Ryan Lortie <desrt desrt ca>
Date:   Fri Jun 7 11:41:41 2013 -0400

    Export __glib_assert_msg
    
    Put __glib_assert_msg in the dynamic symbol table, but not in any public
    headers.
    
    This variable is _not_ part of our API but this way debuggers and
    automated crash report utilities will be able to access this variable,
    even if debug symbols are not available.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=701800

 glib/gtestutils.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/glib/gtestutils.c b/glib/gtestutils.c
index 0b7be46..3ab4e16 100644
--- a/glib/gtestutils.c
+++ b/glib/gtestutils.c
@@ -496,6 +496,7 @@
  * analysis systems like Apport and ABRT to fish out assertion messages from
  * core dumps, instead of having to catch them on screen output.
  */
+GLIB_VAR char *__glib_assert_msg;
 char *__glib_assert_msg = NULL;
 
 /* --- constants --- */