Removed the extra Microsoft.CSharp.targets that MonoDevelop adds when it edits a project that was created with VS2008.  VS2008 is when Microsoft changed the path variable from MSBuildBinPath to MSBuildToolsPath and MonoDevelop still uses MSBuildBinPath.
Removed the extra Microsoft.CSharp.targets that MonoDevelop adds when it edits a project that was created with VS2008.  VS2008 is when Microsoft changed the path variable from MSBuildBinPath to MSBuildToolsPath and MonoDevelop still uses MSBuildBinPath.

henon/GitSharp,henon/GitSharp