[Buildroot] [RFC] progress indicator

[Yegor Yefremov]

What about making a progress indicator, so that user always knows how
many packages left to be built? Like Android (AOSP) does during repo
sync:

Fetching projects:  53% (127/238)  Receiving objects:  22% (290/1289), 195.95 Ki
Fetching projects:  54% (129/238)  Receiving objects:  28% (361/1289), 195.95 Ki
Fetching projects:  55% (131/238)  Receiving objects:  47% (606/1289), 643.81 Ki

Yegor