msvcrt: fread: exhaust buffered data before using unbuffered data in ascii mode

[Dan Kegel]

Fixes http://bugs.winehq.org/show_bug.cgi?id=16511
With testcase.

This should never be worse than the existing code,
and for some inputs it's better.
It would be better still if remove_cr() was stateful, but
I haven't hit a situation in the real world yet that needs that.
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