future (unique_future::get, [...]): Remove workaround for c++/34022.

2009-12-15  Jonathan Wakely  <jwakely.gcc@gmail.com>

	* include/std/future (unique_future::get, promise::set_value): Remove
	workaround for c++/34022.
	(packaged_task::get_future, packaged_task::operator()): Use
	__throw_bad_function_call.
	* testsuite/30_threads/packaged_task/cons/assign_neg.cc: Adjust.
	* testsuite/30_threads/packaged_task/cons/copy_neg.cc: Likewise.
	* testsuite/30_threads/promise/cons/assign_neg.cc: Likewise.
	* testsuite/30_threads/promise/cons/copy_neg.cc: Likewise.
	* testsuite/30_threads/shared_future/cons/assign_neg.cc: Likewise.
	* testsuite/30_threads/unique_future/cons/assign_neg.cc: Likewise.
	* testsuite/30_threads/unique_future/cons/copy_neg.cc: Likewise.

From-SVN: r155269