[glom] Tests: Fix cast error when using dlerror().

[Murray Cumming <murrayc src gnome org>]

commit 6cf7305f565b0e06e16bb77a0d53f6f7d8cd5f7d
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Oct 14 23:40:31 2011 +0200

    Tests: Fix cast error when using dlerror().
    
    * tests/python/test_load_python_library.cc: Noticed on OpenBSD in
    bug #660495 (Jasper Lievisse Adriaanse).
    I don't know why this worked on Linux.

 ChangeLog                                |    8 ++++++++
 tests/python/test_load_python_library.cc |    2 +-
 2 files changed, 9 insertions(+), 1 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index 02f1c11..d15dfe6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,13 @@
 2011-10-14  Murray Cumming  <murrayc murrayc com>
 
+	Tests: Fix cast error when using dlerror().
+
+	* tests/python/test_load_python_library.cc: Noticed on OpenBSD in 
+	bug #660495 (Jasper Lievisse Adriaanse). 
+	I don't know why this worked on Linux.
+
+2011-10-14  Murray Cumming  <murrayc murrayc com>
+
 	Examples: Remove other uses of pygtk.
 
 	* examples/example_lesson_planner.glom: Remove an old button script 
diff --git a/tests/python/test_load_python_library.cc b/tests/python/test_load_python_library.cc
index e018dba..c69a974 100644
--- a/tests/python/test_load_python_library.cc
+++ b/tests/python/test_load_python_library.cc
@@ -12,7 +12,7 @@ int main()
 
   if(!lib)
   {
-    char *error = dlerror();
+    const char *error = dlerror();
     if(error)
     {
       fprintf (stderr, "%s\n", error);