[v3] Fix Solaris symbol versioning (PR libstdc++/54872)

[Rainer Orth]

As reported in the PR, abi_check fails on Solaris 10 and 11 since about
20120817.  On Solaris 10, I get

1 incompatible symbols 
0
_ZNSt12system_errorC1ESt10error_codeRKSs
std::system_error::system_error(std::error_code, std::string const&)
version status: incompatible
GLIBCXX_3.4.11
type: function
status: added

On Solaris 11, there's also

0
_ZNSt12system_errorC2ESt10error_codeRKSs
std::system_error::system_error(std::error_code, std::string const&)
version status: incompatible
GLIBCXX_3.4.11
type: function
status: added

This is in

libstdc++.a[thread.o]: [59]     |         0|       418|FUNC |WEAK |0    |12     |_ZNSt12system_errorC1ESt10error_codeRKSs
libstdc++convenience.a[thread.o]: [59]  |         0|       418|FUNC |WEAK |0    |12     |_ZNSt12system_errorC1ESt10error_codeRKSs

A reghunt revealed that this was introduced by

2012-08-12  Jonathan Wakely  <jwakely.gcc@gmail.com>

       PR libstdc++/52681
       * src/c++11/thread.cc (thread::_M_start_thread): Improve error text
       when threads are not enabled.

The issue seems to be the same as in PR libstdc++/52188, so I'm applying
the same solution.

Bootstrapped without regressions on i386-pc-solaris2.10 and
x86_64-unknown-linux-gnu, ok for mainline?

	Rainer


2012-10-10  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	PR libstdc++/54872
	* config/abi/pre/gnu.ver (GLIBCXX_3.4.11) [!__sun__ && !__svr4__]:
	Don't export _ZNSt12system_errorC*.

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Rainer Orth, Center for Biotechnology, Bielefeld University