Merge remote-tracking branch 'remotes/vivier2/tags/linux-user-for-5.0-pull-request...

Update syscall numbers to kernel 5.5 level

# gpg: Signature made Mon 17 Feb 2020 09:30:12 GMT
# 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-5.0-pull-request:
  linux-user: xtensa: Remove unused constant TARGET_NR_syscall_count
  linux-user: xtensa: Update syscall numbers to kernel 5.5 level
  linux-user: x86_64: Update syscall numbers to kernel 5.5 level
  linux-user: sh4: Update syscall numbers to kernel 5.5 level
  linux-user: mips: Update syscall numbers to kernel 5.5 level
  linux-user: microblaze: Update syscall numbers to kernel 5.5 level
  linux-user: m68k: Update syscall numbers to kernel 5.5 level
  linux-user: arm: Update syscall numbers to kernel 5.5 level
  linux-user: alpha: Update syscall numbers to kernel 5.5 level

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