Set projection matrix for systems with OpenGL 3.1

The projection matrix should also be set for systems
running OpenGL 3.1 with GL_ARB_compatibility extension.

Task-number: QTBUG-28284

Change-Id: I756155a6064dcbff29fd817e676d31f24f559e8c
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>