func go/build.envOr

4 uses

	go/build (current package)
		build.go#L298: 	c.GOARCH = envOr("GOARCH", runtime.GOARCH)
		build.go#L299: 	c.GOOS = envOr("GOOS", runtime.GOOS)
		build.go#L301: 	c.GOPATH = envOr("GOPATH", defaultGOPATH())
		build.go#L338: func envOr(name, def string) string {

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