more timestamp problems

[sfeam <sf...@us...>]

Shige Takeno points out (Bug #2016) that ./prepare; ./configure; make
is currently not working if you start with a git snapshot downloaded
from SourceForge.   That's because the snapshot is a *.zip file that
doesn't include the git metadata, so the attempt to create
timestamp.h by querying git cannot work.

I wonder if we have control over the script on sf.net that creates
a snapshot?   Maybe that script could generate timestamp.h on the fly?

Another possibility is to assume that anyone downloading a snapshot
will unpack it immediately, in which case the timestamp can be the
creation date of the top level source directory.

	other ideas?

		Ethan