disable llext #712

Job	Run time
LP64-WIP	4m 7s
manifest-check	56s
build-linux (mnfst, ptl)	4m 12s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 40s
build-linux (mnfst, mtl lnl)	4m 14s
build-linux (mnfst, tgl tgl-h)	4m 9s
build-linux (zmain, ptl)	4m 3s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	7m 0s
build-linux (mnfst, --all)	4m 38s
build-linux (zmain, mtl lnl)	4m 9s
build-linux (zmain, tgl tgl-h)	4m 48s
build-windows (mtl lnl)	5m 46s
build-linux (-d, mnfst, lnl)	4m 8s
build-windows (imx8 imx8x imx8m imx8ulp)	8m 30s
build-windows (tgl tgl-h)	5m 39s
build-windows (-d, lnl)	5m 49s
build-windows (ptl)	5m 49s
compare-linux-win	26s
	1h 25m 3s

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