Log Message:
games/hex-a-hop: Fix iconv NetBSDism so DragonFly can build

I would wager that more platforms than just DragonFly need the original
unpatched code for this to build.  I would like to have the patch conditional
on __NetBSD__, but because it's been patched like this so long, I'm leaving
the NetBSDism as the default and the original code switched on with
__DragonFly__.  Other platforms will have to tag on as they get identified.