ubox: update to the latest version, fixes syslog issues

ubox: update to the latest version, fixes syslog issues

7a49632 logd: use uloop instead of ustream_fd for syslog
69d6542 logd: only create pipe in stream mode
df30c8c logread: terminate after EOF
bdcacad logd: implement oneshot mode for stream log read
4a10d4e logread: use oneshot mode without -f, wait for logd to close
ea3d7fa logd: enforce line length limit for ubus based log messages as well
960a29d logread: remove leftover debug code
a081904 logread: fix line buffer size
2c0d9cf logd: move stripping of newlines to log_add()

Signed-off-by: Felix Fietkau <nbd@nbd.name>