msvcrt [3/4]: Fix fread

[Duane Clark]

On Windows, _read() does not necessarily return the requested number of 
bytes in text mode, but fread does if the data is available. The 
previous patch causes Wine to duplicate the Windows behavior of _read. 
But Wine's fread expected _read to return the requested number of bytes, 
if they were available.

So this patch fixes two things. One is that it needs to strip carriage 
returns out of data from the buffer. And the second is that it might 
need to call _read multiple times to completely file the requested buffer.

Changelog: Fix fread

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