[PATCH] libstdc++/89130 and libstdc++/89090 fixes for vector relocation

[Jonathan Wakely]

This fixes two PRs, one trivial (don't use C++17 features in C++11
mode) and one more serious (don't require MoveInsertable when we
should only need CopyInsertable).

It would be nice to rely on if-constexpr in C++11 mode, but it causes
clang warnings, complicates testcase bisection/reduction, and causes
users to file bogus bug reports. So let's just avoid it.

Tested powerpc64le-linux, committed to trunk.


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