[mesa] disable avx support - JB#18552

AVX/SSE4 cpuid information can leak through to the system in some
circumstances and mesa/llvm tries to use it for llvmpipe and
VirtualBox will SIGILL as it doesn't support it.

Signed-off-by: Juha Kallioinen <juha.kallioinen@jolla.com>
Merge pull request #1 from kaltsi/jb18552

[mesa] disable avx support - JB#18552