Fix textureLOD for PowerVR workaround

https://forums.unrealengine.com/showthread.php?61511-A-few-questions-in-regard-to-texture-compression-reflections-and-deployment&highlight=powervr

This code was added back on 8/2013, changelist 1786663, when we had barely any Android support, needs to be fixed/updated since it might be already fixed!

// @todo: Patch the code so that textureCubeLodEXT gets converted to textureCubeLod to workaround PowerVR issues
const ANSICHAR* VersionString = FCStringAnsi::Strfind(ShaderSource, "#version 100");