More libsodium stuff

[Hal Murray]

>> I have a hack that makes it work on NetBSD.
>>       ln -s  /usr/pkg/lib/libsodium.so.18 /usr/lib/libsodium.so.18

Stromeko at nexgo.de said:
> That sounds like a packaging problem of libsodium on that system or you've
> missed to run the post-install step that updates ld-so.conf via ldconfig. 

"Packaging problem" sounds right.  Thanks.

Browsing man pages, ldconfig is for a.out.  I'm using elf so I switch over to 
ld.elf_so  That man page says it searches:
  1: LD_LIBRARY_PATH and ld.so.conf (but ld.so.conf is a security risk.  I 
don't have one)
  2: DT_RPATH
  3: list of defaults which is /usr/lib

Eric: Do you want to try the RPATH route?  I remember lots of "fun" from when 
gpsd tried that, but that was trying to use local libraries for testing and 
installed libraries when code was installed.

I think I found a man page with interesting linker flags.  I can't find that 
now.  It would require waf hacking, but I could test it by hand.  (But not 
tonight...)


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