[libstdc++] Factor out symbol extraction from abi_check, sort in C locale

[Phil Edwards]

> > 
> > 	* testsuite/abi_check.cc:  Pull shell fragments out into...
> > 	* config/abi/extract_syms:  ...here.  New file.
> > 	* Makefile.am (check_abi):  Change to match.
> > 	(new-abi-baseline):  New target.
> > 	* Makefile.in:  Regenerated.
> 
> After feedback from Benjamin, I changed the name of the script to
> enable_symvers, and have checked this in on trunk.

It's been running without problems for 5 days, so I'm checking this in on the
3.2 branch.  The abi-checking code is now identical on both branches again.


Phil

-- 
I would therefore like to posit that computing's central challenge, viz. "How
not to make a mess of it," has /not/ been met.
                                                 - Edsger Dijkstra, 1930-2002