Add sysloglike attr.

PR/55041: Fix printf format in syslog(3) error message.

always initialize iovcnt

from clang static analyzer

Unbreak build, init variable (not a false alarm for this one.)

openlog(3): add LOG_PTRIM and LOG_NLOG log options.

syslog(3) is the one stop method of logging system events and diagnostics.
When debugging a daemon in the foreground on a terminal, each line is
p

openlog(3): add LOG_PTRIM and LOG_NLOG log options.

syslog(3) is the one stop method of logging system events and diagnostics.
When debugging a daemon in the foreground on a terminal, each line is
prefixed with tag[pid]: which is very repetative and can take up valuable
screen estate.
LOG_PTRIM solves this by removing this prefix from stderr output.

There is also the case where the debugging could involve a dry-run and
syslog(3) calls would pollute the system log with incorrect data.
LOG_NLOG solves this by not writing the the system log, but allowing
LOG_PERROR to operate as before.

Initially discussed here:
https://mail-index.netbsd.org/tech-userlevel/2016/10/06/msg010330.html

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A little more restructuring so that we don't need mutex stuff in syslog_ss.

Split syslog.c to:

- syslog_ss.c *_ss api functions (don't use stdio, time)
- syslog.c: *syslog* non _ss api functions (use stdio, time)
- xsyslog.c> common guts.

The motivation for this is not to

Split syslog.c to:

- syslog_ss.c *_ss api functions (don't use stdio, time)
- syslog.c: *syslog* non _ss api functions (use stdio, time)
- xsyslog.c> common guts.

The motivation for this is not to drag in stdio/locale/floating point/time
for every binary, since syslog_ss() is used in __stack_check_fail() for SSP.

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