[Toybox] [PATCH] df: -a should even show mounts we couldn't stat.

[enh]

In xgetmountlist(), keep track of whether we could stat or not, so we
can distinguish an actual device 0:0 from a failed stat/statvfs.

Also switch to FLAG() and capitalize POSIX.
---
 lib/lib.h         |  1 +
 lib/portability.c | 12 ++++-------
 toys/posix/df.c   | 55 ++++++++++++++++++++++++++++-------------------
 3 files changed, 38 insertions(+), 30 deletions(-)
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