Switching the default for -fabi-version

[law@redhat.com]

In message <Pine.LNX.4.44.0310221445510.16615-100000@wotan.suse.de>, Michael Ma
tz writes:
 >So, definitely yes.  I doubt though, that it matters, because we also link
 >against libstdc++ (of course), and hence the new compiler anyway means
 >full recompilation and lost of backward compatibility.  I hope that
 >somewhen this all becomes better, like with glibc ;-)
All true.  However, does KDE have a plug-in architecture?  If so, then it's
quite possible, even likely based on your data that revving up the ABI
will mean that you also have to rebuild all the plug-ins if you rebuild
KDE. 

Similarly for Mozilla (which worries me even more).

jeff