[windows] skip 'Go plugins are not supported on Windows'

garble build -buildmode=plugin ./plugin
binsubstr plugin.so 'PublicVar' 'PublicFunc'
! binsubstr plugin.so 'privateFunc'

# Note that we need -trimpath; see the caveat section in the README.
go build -trimpath
exec ./main
cmp stdout main.stdout
binsubstr main$exe 'PublicVar' 'PublicFunc'
! binsubstr plugin.so 'privateFunc'

[short] stop # no need to verify this with -short

go build -buildmode=plugin ./plugin
binsubstr plugin.so 'PublicVar' 'PublicFunc' 'privateFunc'
go build
exec ./main
cmp stdout main.stdout

-- go.mod --
module test/main
-- plugin/main.go --
package main

import "fmt"

var PublicVar int

func privateFunc(n int) { fmt.Printf("Hello, number %d\n", n) }

func PublicFunc() { privateFunc(PublicVar) }
-- main.go --
package main

import "plugin"

func main() {
	p, err := plugin.Open("plugin.so")
	if err != nil {
		panic(err)
	}
	v, err := p.Lookup("PublicVar")
	if err != nil {
		panic(err)
	}
	f, err := p.Lookup("PublicFunc")
	if err != nil {
		panic(err)
	}
	*v.(*int) = 7
	f.(func())()
}
-- main.stdout --
Hello, number 7