skybox_change: Disable when BXT is found #728

Job	Run time
rustfmt	12s
stable - Ubuntu - debug	1m 44s
clippy - Ubuntu	37s
stable - Debian (cross to Windows) - debug	1m 7s
clippy - Windows	2m 6s
stable - Ubuntu - release	2m 20s
stable - Debian (cross to Windows) - release	1m 40s
beta - Ubuntu - debug	1m 41s
beta - Debian (cross to Windows) - debug	1m 15s
stable - Windows - debug	4m 58s
stable - Windows - release	4m 49s
beta - Windows - debug	2m 27s
Publish Wiki	0s
	24m 56s

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