Enable VMWare 3D Acceleration on Centos 7 Desktop

The default CentOS 7 Desktop uses GNOME Shell 3 which requires 3D
acceleration to work smoothly. If 3D acceleration isn't enabled it falls
back to software-based rendering through LLVMpipe which is usable but
slow. Additionally, 3D Acceleration is enabled for VirtualBox guests
anyway.
Merge pull request #14 from lvillani/vmware-3d-acceleration

Enable VMWare 3D Acceleration on Centos 7 Desktop