[PATCH] Define __cpp_lib_tuple_element_t in <tuple> not <utility>

[Jonathan Wakely]

On 14/06/18 15:00 +0100, Jonathan Wakely wrote:
>During the review of P0941R2 in Rapperswil we noticed that SD-6 puts
>the macro __cpp_lib_tuple_element_t in <utility>, but it should be in
><tuple>.
>
>	* include/std/tuple (__cpp_lib_tuple_element_t): Move feature test
>	macro from <utility> and change type to long.
>	* include/std/utility (__cpp_lib_tuple_element_t): Remove.
>	* testsuite/20_util/tuple/tuple_element_t.cc: Check for feature test
>	macro.
>
>Tested x86_64-linux, committed to trunk.

This caused some tests to fail (but not for me, maybe because of
precompiled headers). I'm moving the macro and the alias template back
to <utility>, but keeping the change of the macro value from int to
long (as required by the C++2a working paper).

Tested powerpc64le-linux, committed to trunk.

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