Bug#749580: llvm-3.5-dev:amd64: Shipped cmake files are broken

[Ralf Jung]

Hi,

unfortunately, this error persists in the current, stable (and now
default) version of llvm-3.5-dev. Essentially this means that to compile
a program that uses libllvm through cmake, it is necessary to compile
the upstream llvm manually, and deal with all the issues arising due to
having two llvm toolchains installed.

Kind regards
Ralf