Bug#357629: This patch needs changes

[Phil Endecott <phil_xgpal_endecott@chezphil.org>]

I've just tried building gcc-3.3 with this patch applied and it gets the 
Provides: lines wrong for libstdc++.  Comparing it with the patch for gcc-3.4 
(bug #357658) I changed the mentions of GCC_SO to CXX_SO in the obvious 
places, and it superficially seems to work.

(I'd love to see a release of gcc-3.3 including this fix - it would have saved 
me a lot of pain over the last few days!)

Thanks,  Phil.