disable llext #719

Job	Run time
LP64-WIP	3m 47s
manifest-check	48s
build-windows (-d, lnl)	4m 41s
build-windows (mtl lnl)	5m 17s
build-windows (ptl)	5m 34s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	3m 50s
build-linux (mnfst, ptl)	4m 2s
build-windows (imx8 imx8x imx8m imx8ulp)	4m 43s
build-linux (zmain, tgl tgl-h)	5m 22s
build-linux (mnfst, mtl lnl)	4m 2s
build-windows (tgl tgl-h)	5m 34s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	3m 50s
build-linux (mnfst, tgl tgl-h)	4m 0s
build-linux (zmain, mtl lnl)	3m 54s
build-linux (-d, mnfst, lnl)	3m 53s
build-linux (zmain, ptl)	4m 7s
build-linux (mnfst, --all)	3m 49s
compare-linux-win	20s
	1h 11m 33s

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