[v3] tweak regex_error linkage to avoid vaugeness

[Benjamin Kosnik]

This re-arranges <regex>'s exception object to avoid vague linkage bits,
in a similar way to the rest of the exception object hierarchy.

I've opened up an enhancement request for a warning that we can use to
search for similar things in a full-source audit. See 
http://gcc.gnu.org/PR47693

Also, the regex testsuite renames mentioned in passing a week or two
ago.

tested x86_64/linux

-benjamin
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