Bug#834542: [clang] Add symlink for clang/clang++ for clang versions selectable through update-alternatives

[tobias_rie at web.de]

Package: clang
Severity: minor

--- Please enter the report below this line. ---

The packages clang-3.6, clang-3.7 and clang-3.8 should all provide a 
symlink from clang to clang-3.X and clang++ to clang++-3.X and let the 
user decide through update-alternatives which version should be referred 
to as clang/clang++, defaulting to the latest version.


--- System information. ---
Architecture: amd64
Kernel:       Linux 4.6.0-1-amd64

Debian Release: stretch/sid