Don't run prelink

There's no evidence of noticable performance improvements and some
concerns were raised (see https://fedorahosted.org/fesco/ticket/1183).
Use mesa-x86-generic instead of mesa-llvmpipe fort x86 adaptation

We have drivers for x86 hardware now thus we can provide a better
experience with hardware acceleration.
Enable acpid for x86 adaptation

Build with gcc 4.8 was fixed, we can include it now.