2.25.16 glib update

The current version we are using 2.25.15 is an unstable one, 2.25.16 is close from 2.26 which should be rolled today but has some api and abi changes. The changes concern things added during the unstable cycle and GNOME 2.32 tarballs will work with the new glib, it's likely nothing else in the archive use those yet.

The alternative would be to ship maverick with an unstable glib having api not supported by upstream and shipped in not stable glib versions

The NEWS summary for this update:

"Overview of Changes from GLib 2.25.15 to GLib 2.25.16
=====================================================

GApplication:
  GApplication, GAction and related classes have been removed from this
  release of glib. There will -not- be a replacement for 2.26.0.

Build:
  - massive restructuring to reduce #include abuse
  - tweaks to silence some harmless compiler warnings
  - rename gschema-compile.c to glib-compile-schemas.c
  - Windows fixes
  - fix building with zlib < 1.2.4 on win32

GDateTime:
  - better msgctxt for translating month and weekday names
  - API is changed quite a lot, implementation is improved
  - GTimeZone is now exposed

GObject:
  - make ordering for overridden interface properties consistent
  - ->priv structures are limited to 64k but this was not documented,
    and exceeding this limit produced bad results. Add docs and enforce
    the limit properly.
  - add g_object_class_install_properties() to install multiple
    properties in one go
  - improve debugging output for GValue containing G_TYPE_STRV

GIO:
  - fix priority sorting of GIO extensions
  - add GCredentials support on FreeBSD
  - fix support for IPv6 addresses in URI parsing functions
  - GSocketClient fixes for when g_socket_connect succeeds immediately
  - clarify string encoding for GFile constructors in docs
  - new functions g_data_input_stream_read_upto{,async,finish}
  - tweak confusing documentation for g_output_stream_write()

GDBus:
  - GDBusMessage can now be locked and copied (like in libdbus)
  - GDBusConnection filter function API has changed again
  - GDBusServer: ::new-connection now declares if the connection was claimed
  - add a partial workaround for GObject bug 627724.
  - very many memory leaks fixed

GVariant:
  - check for size == 0 in g_variant_get_bytestring to avoid a crash
    when attempting to get_bytestring() from an empty array
  - improve gobject-introspection annotations

GSettings:
  - add GSettings Windows registry backend
  - some internal tweaks to the backend API
  - remove g_settings_list_items
  - add g_settings_list_children and _list_keys to replace it
  - add schema compiler restrictions for dealing with lists
  - don't automatically emit value changed signals on writability
    changes

Other:
  - constify the 'parser' vtable param to g_markup_parse_context_push()
  - plug many memory leaks in test cases

Bugs closed:
  50076 Time API to go with date API
 584284 g_data_input_stream_read_until_async different from sync version
 624546 Modification of GDBusMessage in filter function
 626919 Let g_object_class_install_property() return the installed GParamSpec*
 628029 GDateTime missing get_week_of_year method
 628253 Interface properties not listed in a consistent order
 628331 Plug lots of mem leaks in gio test suite
 628345 Plug a mem leak
 628436 Plug a mem leak
 628505 Fix building with zlib < 1.2.4 on win32
 628839 [PATCH] datetime: Rename shadowing variables
 628904 [PATCH] Add credential support for FreeBSD and fix a socket issue
 628952 incorrect glib_major_version and other variables on cygwin.
 629192 g_strdup_value_contents(): dump GStrv more usefully
 629251 g_socket_client_async_connect_complete: assertion failed
 629259 Failed to connect to "::1"
 629328 g_markup_parse_context_push doesn't respect const structs
 629429 month "May" short and full form same with "GDateTime" msgctxt
 629689 GDBusConnection leaks its GCredentials
 629698 Segfault in g_variant_get_bytestring() "