[PATCH 4/3] improve detection of attribute conflicts (PR 81544)

[Martin Sebor]

Jon,

Attached is the libstdc++ only patch to remove the pointless
const attribute from __pool<true>::_M_destroy_thread_key(void*).

   https://gcc.gnu.org/ml/gcc/2017-08/msg00027.html

I only belatedly now broke it out of the larger patch under
review here:

   https://gcc.gnu.org/ml/gcc-patches/2017-08/msg00599.html

Thanks
Martin
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