Add x86 support

[partipan-dot]

[schrnz]

I started working on this today. Compiling ARTist for x86 worked out of the box and I have a prototype of an improved SDK that allows to build arm and x86 modules. The logtimization module works but trace is segfaulting. I will post updates here.

[schrnz]

We have a first version with multi-arch support that fetches & compiles arm and x86. The segfault was not a problem of the SDK itself