Ah! I finally have a progress bar that doesn't stall the build!

 - pipe size in Linux is only 8*512=4096 bytes
 - pipe size is not setable
 - when the feeding process spits out data faster than the eating
   process can read it, then the feeding process stalls after 4KiB
   of data sent to the pipe
 - for us, the progress bar would spawn a sub-shell every line,
   and the sub-shell would in turn spawn a 'date' command.
   Which was sloooww as hell, and would cause some kind of a
   starvation: the pipe was full most of the time, and the
   feeding process was stalled all this time.

Now, we use internal variables and a little hack based onan offset
to determine the elapsed time. Much faster this way, but still
CPU-intensive.

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