Declare sendsyslog to match its man page

This simplifies syzkaller revival after the removal of __syscall.

OK bluhm, millert, deraadt

Rename the system call sendsyslog2 to sendsyslog. Keep the old one
as osendsyslog for a while. The three argument variant is the only
one that will stay.
input kettenis@; OK deraadt@

Add a syscall stub for sendsyslog2(2), and use it in syslog_r(3), passing
LOG_CONS to the kernel. As a result, the /dev/console opening code can
be removed.
ok kettenis millert beck

Do not include a timestamp in the syslog message. There is no need --
syslogd will fill it in immediately upon reception on the other side of
sendsyslog(2). Our libc only talks to our syslogd, whic

Do not include a timestamp in the syslog message. There is no need --
syslogd will fill it in immediately upon reception on the other side of
sendsyslog(2). Our libc only talks to our syslogd, which will fix the
timestamp before forwarding. syslog_r has done this for a long time
already.
ok tedu bluhm

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Wrap <syslog.h> so that internal calls go direct and they're all weak symbols
Delete code that's a no-op now that we don't use sockets
Eliminate unnecessary #includes