Bug#837608: Updating packaging to work with 3.9.0 release

[Pauli .]

tags 837608 patch

Attached patch managed to compile libc++ 3.9.0 with clang-3.9.

I did only minimal testing with it. But test suit for my own library
at least passed when compiled with clang-3.9 and linked to libc++ 3.9.
Of course that test suit uses only small part of standard library but
at least std::map, std::vector, std::string, std::string_view,
exceptions and cxxabi::demangle are required to pass the test suit.

I want to use std:pmr::memory_resource in my project but clang doesn't
compile libstdc++ version of that while packaged libc++ doesn't yet
include polymorphic allocator.
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