build version and date

[J. Alex Aycinena]

The last couple of times that I've done an 'svn update' and rebuilt my
working copy of gnucash, I've noticed that the splash screen shows
'built from svn r19910 on 2010-12-06' even though this is not the
case. The 'About ...' shows the same. Previously it always showed the
correct data. It is the same on both of my systems. Are others seeing
the same or is it something about my systems?

Alex