[patch] Remove unused pattern from GLIBCXX_3.4.11 version

[Jonathan Wakely]

This removes the _ZNSt12system_errorC* pattern from the GLIBCXX_3.4.11
version, because it doesn't seem to be used at the moment, but inlining
changes being tested for PR ipa/58721 cause some new symbols to be
added to the library and exported with version GLIBCXX_3.4.11, which
obviously shouldn't be getting new symbols now.

This happened for Solaris previously, and Rainer disabled the pattern
for Solaris: http://gcc.gnu.org/ml/libstdc++/2012-10/msg00070.html
This patch does the same for all targets.

Tested x86_64-linux, committed to trunk.

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commit ee702751f19b333766011c6cd16156ce6c76bb69
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Mar 14 17:26:26 2014 +0000

    	PR ipa/58721
    	* config/abi/pre/gnu.ver (GLIBCXX_3.4.11): Remove unused pattern for
    	_ZNSt12system_errorC* symbols which are not exported on any target.

diff --git a/libstdc++-v3/config/abi/pre/gnu.ver b/libstdc++-v3/config/abi/pre/gnu.ver
index 2010bd3..f3afb94 100644
--- a/libstdc++-v3/config/abi/pre/gnu.ver
+++ b/libstdc++-v3/config/abi/pre/gnu.ver
@@ -1056,12 +1056,6 @@ GLIBCXX_3.4.11 {
     _ZTISt12system_error;
     _ZTVSt12system_error;
     _ZNSt12system_errorD*Ev;
-    # Those template instantiations weren't exported on Solaris in GCC 4.6
-    # and aren't necessary for correct operation, so don't emit them now
-    # (PR libstdc++/54872).
-#if !defined(__sun__) && !defined(__svr4__)
-    _ZNSt12system_errorC*;
-#endif
 
     _ZNKSt4hashISt10error_codeEclES0_;