[patch] libstdc++/70503 Ensure std::thread helpers have internal linkage

[Jonathan Wakely]

This makes the execute_native_thread_routine* helpers 'static' rather
than using an unnamed namespace, because the latter doesn't give them
static linkage due to them being extern "C".

Tested x86_64-linux, committed to trunk. Backports to gcc-5 and
gcc-4.9 to follow soon.

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