[Patch] libstdc++/14493

[Paolo Carlini]

Hi,

this is the result of the recent discussions in mailing list and audit 
trail, pretty straightforward at this point. I'm going to wait a bit in 
case there are better options for gnu.ver: not knowing well the 
rationale behind the CXXABI tag, I was rather surprised to find 
std::bad_alloc::~bad_alloc exported as a generic library, not libsupc++ 
symbol (it belongs to the latter, strictly speaking). In the below I'm 
simply continuing the tradition, adjusting the existing exports and 
adding some for the what method (at 3.4.11, because we may want to 
commit the debug-mode thread safety fixes separately in 4_2-branch).

Tested x86-linux.

Paolo.

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