glibc's fts(3) is broken

Discovered this while testing quark on musl: https://wiki.musl-libc.org/faq#Q:-Why-is-%3Ccode%3Efts.h%3C/code%3E-not-included?

It makes sense for us to include our own fts, chimera-linux has a port, or just include the one from openbsd verbatim.

glibc is the gift that keeps on giving.