fts: cleanup after FTS_NOATIME removal * lib/fts_.h (FTS_VERBATIM, FTS_OPTIONMASK, FTS_NAMEONLY) (FTS_STOP): Shrink to minimal values. We don’t need to worry about binary compatibility in Gnulib, and the old way of doing things had a hole in the user options that caused FTS_OPTIONMASK to not work as desired.