[patch] libstdc++/66829 use -std=gnu++98 to compile testsuite_shared.cc

[Jonathan Wakely]

This file contains some C++98 instantiations that are then compared to
similar instantiations in C++11 tests, so it needs to be compiled with
an explicit -std option now that g++ defaults to gnu++14.

Tested i686-linux, x86_64-linux and ppc64le-linux.

Committed to trunk.

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