[GLES2] Improve PowerVR SDK discovery on Windows and add support for the paths in the 3.0 sdk.
[GLES2] Improve PowerVR SDK discovery on Windows and add support for the paths in the 3.0 sdk.

RealityFactory/ogre,RealityFactory/ogre,RealityFactory/ogre,paroj/ogre,OGRECave/ogre,OGRECave/ogre,RealityFactory/ogre,OGRECave/ogre,paroj/ogre,RealityFactory/ogre,paroj/ogre,paroj/ogre,paroj/ogre,OGRECave/ogre,OGRECave/ogre