gcc/ChangeLog:
PR bootstrap/82610
* system.h: Conditionally include "unique-ptr.h" if
INCLUDE_UNIQUE_PTR is defined.
* unique-ptr-tests.cc: Remove include of "unique-ptr.h" in favor
of defining INCLUDE_UNIQUE_PTR before including "system.h".
include/ChangeLog:
* unique-ptr.h: Make include of <memory> conditional on C++11 or
later.
From-SVN: r254024