[1.2.X] Fixed #13488 -- No longer generate unhandled exceptions that may occur...

[1.2.X] Fixed #13488 -- No longer generate unhandled exceptions that may occur when destructors of global GEOS I/O objects are called on process termination.

Backport of r15378 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@15379 bcc190cf-cafb-0310-a4f2-bffc1f526a37