opencv未能加载导入的项目文件，跟级别上的数据无效

C:\Users\Administrator\AppData\Local\Microsoft\MSBuild\v4.0下的文件需要重建。

变为

<?xml version="1.0" encoding="utf-8"?> 
<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <ImportGroup Label="PropertySheets">
  </ImportGroup>
  <PropertyGroup Label="UserMacros" />
  <PropertyGroup />
  <ItemDefinitionGroup />
  <ItemGroup />
</Project>