MSBuildInternals: when creating a temporary MSBuild project to inspect the properties of a non-default configuration, specify the path of the project file so that projects containing <Import Project="relativePath" /> can be loaded (fixes editing properties in the release configuration of the forms designer project)
git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/2.1@2582 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61