linux-user: strace now handles unshare syscall args correctly

Syscall unshare did not have custom print function for strace, but it's argument is same as flags in clone syscall, so it can be easily implemented.
Also updated missing flags from clone_flags.

Signed-off-by: Matus Kysel <mkysel@tachyum.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20210406144203.1020598-1-mkysel@tachyum.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2 files changed