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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