add compile-time flag to disable Go GC
I hate this, but it's the only good way I could find to allow working around this ugly QEMU bug: https://gitlab.com/qemu-project/qemu/-/issues/2560
I hate this, but it's the only good way I could find to allow working around this ugly QEMU bug: https://gitlab.com/qemu-project/qemu/-/issues/2560