MB-11244: Don't try to cleanly shut down the logger (WIN32)

Unfortunately it looks like the C runtime from MSVC "kills" the
threads before the "atexit" handler is run, causing the program
to halt in one of these steps depending on the state of the
variables. Just disable the code for now.

Change-Id: I314bb689b26e87a60b15ed996752ce33803c2912
Reviewed-on: http://review.couchbase.org/38077
Tested-by: Trond Norbye <trond.norbye@gmail.com>
Reviewed-by: Michael Wiederhold <mike@couchbase.com>