WITH_LIBCPLUSPLUS buildworld broken on STABLE-9

[Oleg V. Nauman]

===> lib/libc++ (all)
clang++  -O -pipe -march=i686 -mtune=i686  
-I/usr/src/lib/libc++/../../contrib/libc++/include  
-I/usr/src/lib/libc++/../../contrib/libcxxrt -nostdlib -DLIBCXXRT  
-Qunused-arguments -fstack-protector -Wno-empty-body  
-Wno-string-plus-int -Wno-tautological-compare -Wno-unused-value  
-Wno-parentheses-equality -Wno-unused-function -Wno-conversion  
-Wno-switch -Wno-switch-enum -Wno-parentheses -c  
/usr/src/lib/libc++/../../contrib/libc++/src/algorithm.cpp -o  
algorithm.o
In file included from  
/usr/src/lib/libc++/../../contrib/libc++/src/algorithm.cpp:10:
In file included from  
/usr/src/lib/libc++/../../contrib/libc++/include/algorithm:596:
/usr/src/lib/libc++/../../contrib/libc++/include/cstdlib:134:9: error:  
no member named
       'at_quick_exit' in the global namespace
using ::at_quick_exit;
       ~~^
/usr/src/lib/libc++/../../contrib/libc++/include/cstdlib:135:9: error:  
no member named
       'quick_exit' in the global namespace
using ::quick_exit;
       ~~^
/usr/src/lib/libc++/../../contrib/libc++/src/algorithm.cpp:14:1:  
warning: inline
       namespaces are a C++11 feature [-Wc++11-extensions]
_LIBCPP_BEGIN_NAMESPACE_STD
^
/usr/src/lib/libc++/../../contrib/libc++/include/__config:264:52:  
note: expanded from
       macro '_LIBCPP_BEGIN_NAMESPACE_STD'
#define _LIBCPP_BEGIN_NAMESPACE_STD namespace std {inline namespace  
_LIBCPP_NAMESPACE...
                                                    ^
1 warning and 2 errors generated.
*** [algorithm.o] Error code 1

Stop in /usr/src/lib/libc++.
*** [all] Error code 1

Stop in /usr/src/lib.
*** [lib__L] Error code 1

Stop in /usr/src.
*** [libraries] Error code 1

Stop in /usr/src.
*** [_libraries] Error code 1

Stop in /usr/src.
*** [buildworld] Error code 1

Stop in /usr/src.