[DOCS] dead links in documentation

The following external links in the documentation have been dead for a
while.  I haven't been able to find any plausible replacements, so I
propose to remove them unless someone has a better idea.

http://itrc.hp.com
http://www.hp.com/go/gcc

(These were proposed for downloading additional software for HP-UX.)

https://blogs.oracle.com/robertlor/entry/user_level_dtrace_probes_in

(This blog appears to have been deleted.)

-- 
Peter Eisentraut              http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services


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