[PATCH] Fix strv_addn(), add strv_split()

[Martin Schwenke]

2 patches attached:

1. Fix strv_addn()

   Well, this is embarrassing!  I added strv_add() last week but it
   doesn't do what it was meant to and actually produces an invalid
   strv.  :-(

   This fixes it and adds some tests for it.

   Given that the patch goes close to a revert, I'm happy with the
   alternative of reverting and adding this anew... but it seems like
   more hassle.

2. Add strv_split() in new file strv_util.[hc] + tests

   I mentioned this to Volker and he wants to keep strv.[hc] small, so
   suggested that a layer on top could go in an extra file, so here it
   is.

Clearly (2) depends on (1), since it uses strv_addn().

Please review and maybe push...

peace & happiness,
martin
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