[Toybox] [PATCH] ps, vi: fix flicker.

[enh]

My earlier trick to ensure that we buffer whole screens full works fine
on glibc, but both bionic and musl have a tiny 1024-byte BUFSIZ that
makes it unsuitable for this kind of use, even on laptop screens.

Explicitly say 8192, since 4096 is slightly too small for my larger
laptop's screen (and I don't use a particularly small font).

At some point we should probably move this into tty.c, dynamically
allocate based on screen size (plus space for escape sequences/non-ASCII
characters), and track SIGWINCH in case the window grows. But this stops
top and vi flickering today, which is good enough for now. (Amusingly, I
hit the vi problem -- which is actually much worse, for dense strace
output -- while debugging the top problem, while debugging the ps
problem, while debugging the thing I was actually supposed to be doing
_yesterday_. So definitely time to back out of a few rat holes!)
---
 toys/pending/vi.c | 2 +-
 toys/posix/ps.c   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
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