Build fix: Issue with hierarchy of projects in sln file

#### Purpose

Build failed. Need to fix.

#### Modifications

Removed line on which MSBuild was screamed. Local build is successful. Hopefully it will resolve build on server.
![image](https://cloud.githubusercontent.com/assets/8158551/4461740/e8b3c8d2-48bc-11e4-8178-68d45e333659.png)

#### Additional references

[MAGN-4829](http://adsk-oss.myjetbrains.com/youtrack/issue/MAGN-4829).

#### Reviewers

@Benglin, please take a look.