Fix the 32-bit binary

[nictuku]

x86 can also run in 64-bit computers, so ideally we should use that.
Unfortunately, I temporarily lost the ability to build 32-bit binaries.
The trayhost library uses cgo, which makes it annoying.
So we'll use amd64 temporarily for a bit.

I think this explains how to do it. (needs gcc for 32bit installed on windows... blergh)
https://golang.org/cmd/cgo/