[xml] Windows build changes

[Rob Richards <rrichards ctindustries net>]

Forgot to mention these last week, but I made a few changes/additions to the windows build.
A static for dll build is made by default (libxml2_a_dll.lib).
Added flag to embed manifest for VS2005 (vcmanifest=yes).

I noticed Bug 393084. The new flag can be used for that and not sure why copy is not working in the makefiles 
for the reporter (builds fine on 3 different win systems with VS2005 for me).

Rob