Merge tag '2023q3-bsd-user-pull-request' of https://gitlab.com/bsdimp/qemu into staging

Pull request for bsd-user 2023 Q3 (first batch)

First batch of commits submitted by my GSoC student Karim Taha

These implement	the stat, statfs, statfh and dirents system calls.

In addition, fix a missing break statment, and submit Richard Henderson's
elf stat mmap cleansup.

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* tag '2023q3-bsd-user-pull-request' of https://gitlab.com/bsdimp/qemu: (36 commits)
  bsd-user: Add missing break after do_bsd_preadv
  bsd-user: Add getdents and fcntl related system calls
  bsd-user: Add glue for statfs related system calls
  bsd-user: Add glue for getfh and related syscalls
  bsd-user: Add glue for the freebsd11_stat syscalls
  bsd-user: Add os-stat.c to the build
  bsd-user: Implement do_freebsd_realpathat syscall
  bsd-user: Implement freebsd11 netbsd stat related syscalls
  bsd-user: Implement freebsd11 getdirents related syscalls
  bsd-user: Implement freebsd11 statfs related syscalls
  bsd-user: Implement freebsd11 fstat and fhstat related syscalls
  bsd-user: Implement freebsd11 stat related syscalls
  bsd-user: Implement stat related syscalls
  bsd-user: Implement getdents related syscalls
  bsd-user: Implement statfs related syscalls
  bsd-user: Implement statfh related syscalls
  bsd-user: Implement stat related syscalls
  bsd-uesr: Implement h2t_freebsd_stat and h2t_freebsd_statfs functions
  bsd-user: Implement target_to_host_fcntl_cmd
  bsd-user: Implement h2t_freebds11_statfs
  ...

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>