[BusyBox] syslog prefix patch

[Jason Luther]

This patch allows the user to prepend an arbitrary prefix to syslog messages
when network logging is enabled.

I tried to stick to the BusyBox coding style, but I wasn't able to avoid
putting in "#ifdef BB_FEATURE_SYSLOG_PREFIX ... #endif" blocks.

This feature adds 184 bytes on my i386 system.

This is the additional usage message:
    -p PREFIX Prepend PREFIX to messages when network logging is enabled

So invoking "syslogd -L -R 10.2.27.100 -p PREFIX" on 10.2.27.8 gives you
this in the remote log:
  Jan  3 12:18:22 10.2.27.8 PREFIX syslogd started: BusyBox v0.60.3-pre
(2002.01.03-20:15+0000)

The patch is generated from today's snapshot. Any suggestions are
appreciated.

Cheers,
Jason
jason at ixid.net

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