[libcxx] [PATCH] Fix static no-rtti build

[Alexey Samsonov]

Hi Howard!

Re-sending a patch, that #ifdefs out undefined function in static build of
libc++ w/o RTTI.
This helps with errors of the form:
(libc++.a.memory.cpp.o):/tmp/tmp.boBpS5zFqt/libcxx/src/memory.cpp:function
vtable for std::__1::__shared_weak_count: error: undefined reference to
'std::__1::__shared_weak_count::__get_deleter(std::type_info const&) const'

-- 
Alexey Samsonov, MSK
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