KAFKA-1194 Forces unmapping of buffer if on Windows

[mmanna-sapfgl]

In response to KAFKA-1194 issue, it now forces buffer to unmap if running on Windows OS. Invdividual Unit Test 'testChangeFileSuffixes' on LogSegmentTest.scala passes. but other file IO related unit tests still fail on Windows (Which is irrelevant to this code change).

[mmanna-sapfgl]

@guozhangwang or @vahidhashemian could we get this reviewed by one of the members? This is a change long overdue, and we have to build this into kafka release every time we want to upgrade. The relevant test testChangeFileSuffixes in LogSegmentTest.scala passes on Windows and Linux successfully.

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