fts: set to musl-fts on musl

NetBSD fts wasn't really designed to be used in this way, and it can
produce some strange errors — e.g. I sometimes see duplicate symbols
when musl and libnbcompat define the same symbol.

More packages used musl-fts directly than the fts package anyway,
which can now be changed to use the generic fts.

Unlike netbsd.fts, musl-fts doesn't have a setup hook, so we have to
tell packages that don't know about it to link against libfts.  We
could decide to copy netbsd.fts's setup hook later if we want to.

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