Sync from coreutils.

Sync from coreutils.
* modules/yesno (Depends-on): Add getline.
* gethrxtime.c, gethrxtime.h, getpass.h, mountlist.h, path-concat.c,
regex.h, strtoll.c, unlocked-io.h, xtime.h:
White space changes only.
* makepath.c (make_path): Port to hosts where leading "//" is special.
* yesno.c: Include getline.h, not ctype.h.
(yesno): Don't remove leading white space; POSIX doesn't allow it.
Use getline to remove arbitrary restriction on response length.