libntp/lib_strbuf.c.1.o created more than once

[Hal Murray]

from the bottom of waf build -v

* Node /home/murray/ntpsec/play/build/main/libntp/lib_strbuf.c.1.o is created 
more than once (full message on 'waf -v -v'). The task generators are:
  1. 'ntp' in /home/murray/ntpsec/play/libntp
  2. 'ntp' in /home/murray/ntpsec/play/libntp
If you think that this is an error, set no_errcheck_out on the task instance


-- 
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