MinimumRequirements: add QEMU user space emulator

Updates golang/go#77572.

Change-Id: I6a6a636c304e3b90bb91f96b489fcb8fcf3bf454
Reviewed-on: https://go-review.googlesource.com/c/wiki/+/746600
Auto-Submit: Michael Pratt <mpratt@google.com>
Commit-Queue: Michael Pratt <mpratt@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>