RFC: 64bit compilation warning removal

[Shaw Vrana]

I forgot to attach any warnings to my previous post.  Unfortunately, the 
machine I was using has disappeared and the build stops after one 
warning.  Thus, this is currently the only warning I have, but there are 
at least a handful more.

  ../../src/hostfile.c: In function `extract_salt':
../../src/hostfile.c:92: warning: unsigned int format, different type 
arg (arg 2)

Thanks again,
Shaw