Merge remote-tracking branch 'remotes/vivier2/tags/linux-user-for-5.1-pull-request...

Merge remote-tracking branch 'remotes/vivier2/tags/linux-user-for-5.1-pull-request' into staging

linux-user 20200728

Fix "pgb_reserved_va: Assertion `guest_base != 0' failed." error
Fix rt_sigtimedwait() errno
Fix getcwd() errno

# gpg: Signature made Tue 28 Jul 2020 13:34:11 BST
# gpg:                using RSA key CD2F75DDC8E3A4DC2E4F5173F30C38BD3F2FBE3C
# gpg:                issuer "laurent@vivier.eu"
# gpg: Good signature from "Laurent Vivier <lvivier@redhat.com>" [full]
# gpg:                 aka "Laurent Vivier <laurent@vivier.eu>" [full]
# gpg:                 aka "Laurent Vivier (Red Hat) <lvivier@redhat.com>" [full]
# Primary key fingerprint: CD2F 75DD C8E3 A4DC 2E4F  5173 F30C 38BD 3F2F BE3C

* remotes/vivier2/tags/linux-user-for-5.1-pull-request:
  linux-user: Use getcwd syscall directly
  linux-user: Fix syscall rt_sigtimedwait() implementation
  linux-user: Ensure mmap_min_addr is non-zero

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>