Update to 1.260:

Overview of changes in Glib 1.260 (stable)
==========================================

* Tell CPAN to ignore POD fragments in Makefile.PL
* Document that SOURCE_CONTINUE and _REMOVE can be exported

Overview of changes in Glib 1.253
=================================

* Export the constants SOURCE_CONTINUE and SOURCE_REMOVE on request.
  (RT #48070)
* Create and register a GType for GConnectFlags.

Overview of changes in Glib 1.252
=================================

* Make the recent thread-safety improvements work for non-threaded perls too.

Overview of changes in Glib 1.251
=================================

* Make signal marshalling more thread-safe.  When a signal handler is invoked
  from a foreign thread without associated Perl interpreter, hand the
  marshalling over to the main loop which in turn later wakes up the main
  thread and lets it handle the request.  Since this approach is experimental,
  there is debug print for now whenever it is used:
    *** GPerl asked to invoke callback from a foreign thread;
        handing it over to the main loop

Overview of changes in Glib 1.250
=================================

* Add a fallback implementation of SvMAGIC_set; Bugzilla bug #665266
* Avoid a syntax error on older perls
* Glib::Object: make ref-counting compatible with perl >= 5.16 (RT#73650)
* Fix some typos in POD (RT#73616)

(wiz)