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testdata/script: include regression test for LTO

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	`1`	`+# Regression test for https://go.dev/issue/413974:`
	`2`	`+# cgo build should reproduce binaries with LTO enable`
	`3`	`+`
	`4`	`+[!cgo] skip`
	`5`	`+[short] skip 'links cgo binaries'`
	`6`	`+`
	`7`	`+env GOFLAGS=-ldflags=-linkmode=external`
	`8`	`+env CGO_CFLAGS=-flto`
	`9`	`+`
	`10`	`+go build -o main.exe`
	`11`	`+mv main.exe main1.exe`
	`12`	`+`
	`13`	`+env GOCACHE=$WORK${/}gocache`
	`14`	`+mkdir $GOCACHE`
	`15`	`+go build -o main.exe`
	`16`	`+mv main.exe main2.exe`
	`17`	`+`
	`18`	`+cmp -q main2.exe main1.exe`
	`19`	`+`
	`20`	`+-- go.mod --`
	`21`	`+module main`
	`22`	`+`
	`23`	`+go 1.18`
	`24`	`+-- main.go --`
	`25`	`+package main`
	`26`	`+`
	`27`	`+import "C"`
	`28`	`+`
	`29`	`+var _ C.int`
	`30`	`+`
	`31`	`+func main() {`
	`32`	`+ println("Hello World")`
	`33`	`+}`

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