msvcrt [2/4]: Fix _read and fgetc

[Duane Clark]

The main change. Most of _read() is converted into an internal read_i() 
function that does not strip carriage returns. MSVCRT__fgetc() and 
MSVCRT__filbuf() are fixed to use the internal read_i, and 
MSVCRT__fgetc() does it's own text stripping.

Changelog: Fix _read and fgetc
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