[tex-k] Prevent "tie" and "ctie" from removing trailing spaces.

[Igor Liferenko]

Hi,

"tie" and "ctie" remove trailing spaces. This presents a problem
(e.g., when you want to see a "diff" of what was changed) as it introduces
a lot of spurious changes into the diff.

For a small example of this:

    echo >foo.ch
    tie -m foo.w cweave.w foo.ch
    diff -u cweave.w foo.w

Same happens with "ctie".

After applying the attached change-files, the spurious change is not introduced.
Hope these changes will be useful in TL.

Igor
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