bsd-user: Misc changes for 9.1 (I hope) V2: Add missing bsd-user/aarch64/target.h This patch series includes two main sets of patches. To make it simple to review, I've included the changes from my student which the later changes depend on. I've included a change from Jessica and Doug as well. I've reviewed them, but more eyes never hurt. I've also included a number of 'touch up' patches needed either to get the aarch64 building, or to implmement suggestions from prior review cycles. The main one is what's charitably described as a kludge: force aarch64 to use 4k pages. The qemu-project (and blitz branch) hasn't had the necessary changes to bsd-user needed to support variable page size. Sorry this is so late... Live has conspired to delay me.