[MSVCRT] Handle CR at buffer boundary and test case

[Uwe Bonnes]

This approach  handles a CR ( \\r) read at a boundary buffer now
internally. No need for fseek() which doesn't work on non-seekable files, as
mentioened by Alexandre.
-- 
Uwe Bonnes                bon at elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
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