disable llext #720

Job	Run time
LP64-WIP	3m 50s
build-windows (ptl)	4m 43s
build-linux (mnfst, ptl)	4m 34s
build-windows (-d, lnl)	4m 49s
manifest-check	45s
build-linux (mnfst, mtl lnl)	4m 33s
build-linux (zmain, tgl tgl-h)	3m 59s
build-linux (mnfst, --all)	3m 48s
build-windows (tgl tgl-h)	4m 53s
build-windows (mtl lnl)	5m 33s
build-linux (zmain, mtl lnl)	3m 52s
build-linux (-d, mnfst, lnl)	3m 45s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	4m 28s
build-windows (imx8 imx8x imx8m imx8ulp)	5m 29s
build-linux (mnfst, tgl tgl-h)	3m 51s
build-linux (zmain, ptl)	3m 50s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	3m 46s
compare-linux-win	1m 15s
	1h 11m 43s

Provide feedback