PR libstdc++/56905
	* libsupc++/exception_ptr.h (copy_exception): Deprecate and
	move implementation to make_exception_ptr.
	* include/std/future (_State_base::_M_break_promise): Replace
	copy_exception with make_exception_ptr.
	* testsuite/18_support/exception_ptr/move.cc: Likewise.
	* testsuite/18_support/exception_ptr/rethrow_exception.cc: Likewise.
	* testsuite/30_threads/future/members/get2.cc: Likewise.
	* testsuite/30_threads/promise/members/set_exception.cc: Likewise.
	* testsuite/30_threads/promise/members/set_exception2.cc: Likewise.
	* testsuite/30_threads/promise/members/set_value2.cc: Likewise.
	* testsuite/30_threads/shared_future/members/get2.cc: Likewise.

From-SVN: r198265