The #1307806 patch failed to apply completely in
r41897, probably because it was generated for Python
2.4.2 which didn't include the AST files.

I've attached a patch which will complete the cleanup
of pythoncore.vcproj and which also cleans up
_elementtree.vcproj.

Note that there is a bug in the current
pythoncore.vcproj: The BUILD macro is defined as 60, it
should be at least 67 as it was in Python 2.4.2.

I didn't fix this since I don't know what's the correct
BUILD number for Python 2.5 (68?).