[PATCH][www] Mention that libcxx is necessary on OS X

[Yuri Gribov via cfe-commits]

Hi all,

According to https://llvm.org/bugs/show_bug.cgi?id=17821 , when Clang gets
built on OS X we need to build it with libcxx and libcxxabi (otherwise
tests will fail to link with "can't find iostream". This patch adds a note
to getting started page. Ok to apply?

Best regards,
Yury Gribov
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