CONFIG_CROSSCOMPILE is not available for thedefaultarchitecture x86.
Result is shown for architecture mips
default or selected kernelversion does not have config value CONFIG_CROSSCOMPILE.
Result is shown for kernelversion 5.4.123

Are you using a crosscompiler

configname: CONFIG_CROSSCOMPILE

Linux Kernel Configuration
└─>Kernel hacking
└─>Are you using a crosscompiler
In linux kernel since version 2.6.12  
Say Y here if you are compiling the kernel on a different
architecture than the one it is intended to run on.