Remove win32 plugin (replaced with select plugin)

Change-Id: Iace331c481cf39b6c548c169adc12b6a71509fcb
Reviewed-on: http://review.couchbase.org/27535
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>