For C++ extensions, use the pthreads definition of PERL_GET_CONTEXT

Configure probes the C compiler to find out whether it supports C11 thread
local storage, and if found uses this for PERL_SET_CONTEXT/PERL_GET_CONTEXT,
in preference to the pthread_setspecific()/pthread_getspecific() approach.

However, we can come unstuck with XS extensions written in C++, as C++ and C
disagree on the syntax used for thread local storage, meaning that the
working token that Configure probed for C turns out to be a compiler error
on C++.

As Configure doesn't have a way to probe for C++ dialects, we just take the
safe option and do the same as 5.34.0 and earlier - use pthreads on C++.

This commit is minimal because the implementation of PERL_SET_CONTEXT for
C11 thread local storage was already defensively written to *also* call
pthread_setspecific().

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