[git commit master] pipe_progress: make it independent of printf machinery

[Denys Vlasenko]

commit: http://git.busybox.net/busybox/commit/?id=19ced5c4253bc154aa499a72b6343e01245c92c0
branch: http://git.busybox.net/busybox/commit/?id=refs/heads/master

function                                             old     new   delta
bb_putchar_stderr                                      -      24     +24
ParseField                                           494     471     -23
progress_meter                                       212     188     -24
xargs_main                                           888     842     -46
pipe_progress_main                                   151     105     -46

Patch is too large, so refusing to show it