Add manually created VC10 project and solution files for the library.

These files were obtained by importing the VC9 files and then setting up the
dependencies correctly in the solution. This is just a temporary solution and
we'll hopefully generate them with bakefile-1 for the 3.0 release but for now
this is better than nothing.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74549 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775