Add Windows ARM32 build

[tigerinus]

Unlike #2516 requesting for a Windows ARM64 build, this is about requesting for a Windows ARM32 build.

I have an old Surface RT2 running ARM32 version of Windows. Can't do much with it other than watching videos and reading news. Having a ARM32 v2ray client would definitely help a lot.

Appreciated!

[RPRX]

可以先手动交叉编译 v2ray/discussion#756

$env:CGO_ENABLED=0
$env:GOARCH="arm"

go build -o v2ray.exe -trimpath -ldflags "-s -w" ./main
go build -o wv2ray.exe -trimpath -ldflags "-s -w -H windowsgui" ./main
go build -o v2ctl.exe -trimpath -ldflags "-s -w" -tags confonly ./infra/control/main

默认 GOARM=5，分别试试 $env:GOARM=6 和 $env:GOARM=7，有性能提升（可用的前提下）

[kslr]

You can use arm5,6,7

[RPRX]

@kslr

https://docs.microsoft.com/zh-cn/windows/arm/

他指的是 windows arm build，或许考虑以后编译时加入？（可以类似 v2ray-linux-arm.zip 的文件结构）

[kslr]

GOOS=windows
GOARCH=arm
GOARM=7

这样么

[RPRX]

@kslr

对，GOARM 分别取值 5/6/7 编译，所有文件打包成 v2ray-windows-arm.zip，就像 linux arm 的一样

以后 arm64 的 windows 也越来越多了，等 golang 支持 windows arm64 时，多加个 v2ray-windows-arm64.zip

[kslr]

https://github.com/v2fly/V2FlyBleedingEdgeBinary/releases/tag/unstable-62813a9edee6d1e4480eb62d81202aa42e31f19f