Sources for adding ftw.h

[Eshan Dhawan]

hello everyone,
As @Vaibhav Gupta <vaibhav.varodek at gmail.com>   told the FreeBSD and NetBSD
implemenattio of ftw.h requirs fts.h which inturn requires sys/mount.h
which requirs many other headres that are not yet implemented so creating a
dependencies chain
requiring to add 10-15 more headers just to add ftw.h
So I started searching alternative sources to add ftw.h . So i found musl
also has a implementation for ftw.h as well and it dosent require fts.h to
be implemented

I would request you all to look into it and see it the implementation is
useful for RTEMS
since they have used a different approach to the functions

ftw.h : https://git.musl-libc.org/cgit/musl/tree/include/ftw.h
ftw.c: https://git.musl-libc.org/cgit/musl/tree/src/legacy/ftw.c
nftw.c: https://git.musl-libc.org/cgit/musl/tree/src/misc/nftw.c
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