linux4.14-headers: include objtool only for the supported architecture (x86_64)
linux4.14-headers: include objtool only for the supported architecture (x86_64)

Closes: #9335 [via git-merge-pr]

necrophcodr/void-packages,floGik/void-packages,floGik/void-packages,EaterOfCode/void-packages,NeoChontrix/void-packages,necrophcodr/void-packages,EaterOfCode/void-packages,NeoChontrix/void-packages,floGik/void-packages,juliendehos/void-packages,coredumb/void-packages,kulinacs/void-packages,juliendehos/void-packages,NeoChontrix/void-packages,kulinacs/void-packages,EaterOfCode/void-packages,necrophcodr/void-packages,floGik/void-packages,necrophcodr/void-packages,coredumb/void-packages,NeoChontrix/void-packages,juliendehos/void-packages,floGik/void-packages,NeoChontrix/void-packages,juliendehos/void-packages,kulinacs/void-packages,EaterOfCode/void-packages,NeoChontrix/void-packages,floGik/void-packages,coredumb/void-packages,necrophcodr/void-packages,kulinacs/void-packages,kulinacs/void-packages,coredumb/void-packages,EaterOfCode/void-packages,coredumb/void-packages,kulinacs/void-packages,juliendehos/void-packages,juliendehos/void-packages,coredumb/void-packages