I think NTS is thread safe now

[Hal Murray]

It gets 23 warnings on Ubuntu:
../../ntpd/nts_client.c:436:5: warning: ignoring return value of 
‘strerror_r’, declared with attribute warn_unused_result [-Wunused-result]

-------

There is a trap in libntp/lib_strbuf.c that should log a message if 
lib_getbuf() is called from other than the main thread.
        msyslog(LOG_ERR, "ERR: lib_getbuf() called from non-main thread.");
Please keep an eye out for them and if you see one, please send me a few lines 
from the log file around that one.

-- 
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