[PATCH] Fix _M_extract_int for grouped hexs and octs

[Benjamin Kosnik]

> It turned out to be due to the terminal ".", which happens to be the
> thousand_separator of "de_DE", now parsed for hexs too! Therefore I substituted
> it with a comma.

A ha! Good job.

> I took also the occasion to remove 3 more static keywords lurking around.

Excellent.

> Is it ok for head, and, after some more testing, 3.1 ??

Yep. I think the 3_1 branch is caught up to mainline now, so you can move 
this over immediately if you'd like.

thanks!
-benjamin