[patch] Handle blank protocol in getservbyname/port

[Paul Rupe]

Hamster 2.0.0.0 calls getservbyname to convert "nntp" to 119, but it uses "" 
as the protocol rather than NULL or "tcp".  In Windows, an empty string 
works the same as NULL, but Linux looks for a protocol named "".  This 
patch passes NULL to the OS if called with an empty string.

License: X11, LGPL
Changelog:
  Paul Rupe <prupe at myrealbox.com>
  Treat blank protocol the same as NULL in getservbyname & getservbyport


-- 
Paul Rupe   <prupe at myrealbox.com>                "She smiled, in the end."
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