Merge 'x86: update x86inc.asm'

Updated to https://code.videolan.org/videolan/x86inc.asm/-/commit/04f14f431ce07ca349b5d87c9e5930f5950cf712

This allows x86’s hardware shadowstack SHSTK to work on ELF platforms.

Reviewed-on: #743

Fixes: #742

Author: TheOneric