Bug 662071-[Win32]-Don't init the Big Clutter Lock

Bug 662071-[Win32]-Don't init the Big Clutter Lock

Since the Windows GUI system is assuming multithreadedness, initializing
locks after entering the GUI portion on Windows is likely to cause
problems[1][2], which results many Clutter programs to crash due to
releasing resources that they did not own.

[1]: Multi-threaded use of GTK+ on Win32 in README.win32 of GTK+
     source package
[2]: Explanation of Windows GUI system regarding its multithreadness
     assumptions-
     http://mail.gnome.org/archives/gtk-list/2011-June/msg00005.html