Bug#904456: Update

[V V]

The problem is that the clang sanitizers are trying to use the
llvm-symbolizer exercutable (see
https://github.com/google/sanitizers/wiki/AddressSanitizerCallStack) to
show the symbols. This file is installed but it has the wrong when a non
default clang package is installed. For me when having installed clang-6.0
it is called `llvm-symbolizer-6.0`.
The linked wiki page details that users can use the ASAN_SYMBOLIZER_PATH
environment variable to set the path for the symbolizer but it looks like
the executable still has to have the exact name because clang refuses to
use llvm-symbolizer-6.0. My solution was to link llvm-symbolizer to
llvm-symbolizer-6.0.
The problem is also present in debian stable.
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