VS support updates

VS support updates

-Fix GLib project/filter files generation as some source items are under
 the "deprecated" subfolder, and filter out the gthread-*.c
-Explicitly specify gthread-win32.c in the GLib project/filter file
 templates, since tarballs are done on Linux.
-Don't define g_static_mutex_get_mutex in the pregenerated
 glibconfig.h.win32(.in) as it is defined in deprecated/gthread.h for Windows