[PATCH] io: Use gnulib fts implementation (BZ 22944, BZ 20331)

[DJ Delorie]

Paul Eggert <eggert@cs.ucla.edu> writes:
> Gnulib often follows a different convention, where < and <= is preferred 
> more often than it is in glibc.

My only preference here is to allow this construct:

  a < b && b < c

(e.g. 0 <= count && count < MAX)

(and only when it fits on one line ;)

But only because that was the way I learned to do "is in range" in high
school math ;-)

I wish C allowed an "a < b < c" syntax.