[PATCH] Fix handling of collating symbols in fnmatch (bug 26620)

[Florian Weimer]

* Andreas Schwab:

> The variable idx contains the index into the extra array, whereas wextra
> points into the extra array at this index, containing the length of the
> following collating sequence in the wide character representation.

Based on the surrounding code, the change looks correct to me.  Thanks
for fixing this.

The test case could use xsetlocale, I think.

Florian
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