CONFIG_ARC_EMUL_UNALIGNED is not available for thedefaultarchitecture x86.
Result is shown for architecture arc

Emulate unaligned memory access (userspace only)

modulename: unaligned.ko

configname: CONFIG_ARC_EMUL_UNALIGNED

Linux Kernel Configuration
└─>ARC Architecture Configuration
└─>Emulate unaligned memory access (userspace only)
In linux kernel since version 3.18 (release Date: 2014-12-07)  
This enables misaligned 16 & 32 bit memory access from user space.
Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
potential bugs in code

source code:
selects
CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW