Finally get the test suite passing in C++03!!

After months of work there are only 4 tests still failing in C++03.
This patch fixes those tests.

All of the libc++ builders should be green.


git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@246275 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/thread/thread.condition/notify_all_at_thread_exit.pass.cpp

@@ -9,6 +9,10 @@
 //
 // UNSUPPORTED: libcpp-has-no-threads
 
+// notify_all_at_thread_exit(...) requires move semantics to transfer the
+// unique_lock.
+// UNSUPPORTED: c++98, c++03
+
 // <condition_variable>
 
 // void