libstdc++: Prevent unwanted ADL in std::to_array [PR111512]

libstdc++: Prevent unwanted ADL in std::to_array [PR111512]

As noted in PR c++/111512, GCC does ADL for __builtin_memcpy if it is
unqualified, which can cause errors for template argument types which
cannot be completed.

Casting the memcpy arguments to void* prevents ADL from considering the
problem type.

libstdc++-v3/ChangeLog:

	PR libstdc++/111511
	PR c++/111512
	* include/std/array (to_array): Cast memcpy arguments to void*.
	* testsuite/23_containers/array/creation/111512.cc: New test.