[Patch] Fix testsuite_shared.cc vs --enable-threads=single

[Paolo Carlini]

Hi,

while doing some experiments, I noticed that testsuite_shared.cc doesn't 
build at all together with --enable-threads=single, thus, the testsuite 
cannot be run, even if in that case the facilities in 
testsuite_shared.cc are not used. I fixed the issue with the below, 
which means automatically using __common_pool_policy<__gnu_cxx::__pool, 
false> in that case.

Unless Benjamin doesn't have in mind something more sophisticated (maybe 
together with the testsuite utils project), I'm going to install it, for 
now.

Tested x86-linux.

Paolo.

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