disable llext #718

Job	Run time
LP64-WIP	3m 48s
manifest-check	48s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	3m 45s
build-linux (zmain, mtl lnl)	4m 53s
build-linux (mnfst, mtl lnl)	4m 4s
build-linux (mnfst, tgl tgl-h)	4m 12s
build-windows (mtl lnl)	5m 13s
build-linux (zmain, tgl tgl-h)	4m 8s
build-linux (mnfst, --all)	4m 13s
build-linux (zmain, ptl)	4m 14s
build-windows (ptl)	4m 59s
build-windows (tgl tgl-h)	5m 3s
build-linux (-d, mnfst, lnl)	4m 16s
build-linux (mnfst, ptl)	4m 30s
build-windows (imx8 imx8x imx8m imx8ulp)	5m 12s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	4m 6s
build-windows (-d, lnl)	5m 27s
compare-linux-win	58s
	1h 13m 49s

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