wc support for different tab widths

[Sebastian Bozlee]

Hi,

I'm sorry if this is the wrong place to post this. This is my first
contribution to an open source project, so feedback is appreciated. I
don't expect it to be put in the official code.

I've added the ability to count tabs as any number of spaces over 0 to
wc. It's used like this:
wc -L --tab-width=4 [files...]

if --tab-width is omitted, it defaults to 8 spaces, like in the
original program.

I've attached a patch (from version 7.4).

- Sebastian Bozlee

wc.patch
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