libllvm3.5v5 (1:3.5.2-3~bpo8+1) breaks lot of stable packes

[Sanjeev <samdraiz@gmail.com>]

I tried to install clang-3.5 from backports depends on
libllvm3.5v5 (1:3.5.2-3~bpo8+1) which breaks a lot of stable packages

https://paste.debian.net/377799/

Mattia Rizzolo(mapreri) suggested to revert v5 changes when backporting
to jessie