msvcrt [1/4]: File read buffer tests

[Duane Clark]

The primary problem these patches attempt to address is the 
malfunctioning ftell when reading a file in text mode (which breaks one 
of my apps). In addition a couple other small bugs are addressed.

Currently, Wine maintains an internal buffer, via the function 
MSVCRT__filbuf(), to avoid many small reads directly from the file. When 
it fills this buffer in text mode, it discards carriage returns, and 
most of the other functions are happy with this.

Unfortunately, this breaks ftell. To make ftell work, the carriage 
returns need to be left in the buffer. Since the other functions were 
expecting them to be already removed, this impacts several other places. 
And specifically, everywhere that uses _read() needs to be checked/fixed.

So the first step is adding a bunch of tests to check all the places 
that might cause problems, and checking both binary and text mode reads.

Changelog: File read buffer tests

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