Log Message:
Update glib2 to 2.48.1

Overview of changes in GLib 2.48.1
==================================

Bugs fixed:
 731988 glocalfile: Avoid a potential NULL pointer dereference
 747107 GVariant varargs documentation: g_variant_get() example
 747478 g_system_thread_set_name() is not implemented for gthread-win32
 748474 g_get_language_names() is not thread-safe
 748530 gthread: W32 implementation of g_get_num_processors() has lame fallback
 748806 GVariant: Better introduction to the concepts and its uses
 749606 tests: always remove app.desktop
 758174 Fix documentation typos
 758738 Usage of GType properties causes crashes due to gulong/gpointer mismatch
 762994 Race condition in GIO/AppFileChooser crashes Firefox/Gtk3
 763379 codegen: Add support for g_autoptr to gdbus-codegen generated objects
 763821 build: Also dist Systemtap files always for gobject/
 764092 gstrfuncs: Document the behaviour of g_strjoinv()
 764574 build: Fix all statfs() tests failing
 764575 tests: Fix compilation errors due to Y2K format problems
 764685 GApplication documentation about handling command-line options is confusing
 764754 '-' in application id: unbreak bus activation and notifications
 765959 socket: set fd field to -1 after closing socket
 765990 Visual Studio: Define inline only when necessary

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