win32: wcwidth_alt.c: new generator script, re-generate code

Previously, scripts/mkwcwidth generated a wcwidth implementation based
on input from the python wcwidth: https://github.com/jquast/wcwidth .

However, that project is not updated frequently, and the less
dependencies - the better.

This new script instead prints an implementation based directly on the
original Unicode files - which it can also download.

It generates the same code as before (same data structures, etc).

It was then used to re-generate libbb/wcwidth_alt.c, as follows:

  ./scripts/mkwcwidth DL=15.1.0 FAST_FUNC > libbb/wcwidth_alt.c

This is the same Unicode version as the previous file, just to make
the codepoint differences visible easily.

These differences are very small, and the script itself explains where
and why it differs from https://github.com/jquast/wcwidth .

Next commits will update the tables to the latest unicode version.

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