The deferred shading example doesn't work on Intel graphics

[fossephate]

I suspect that this may be related to:
SaschaWillems#238

I can't confirm that it does work on other graphics cards, just that it doesn't on my own integrated graphics.

[jherico]

I don't have a test environment to check this. if you want to tackle it and provide a pull request that fixes it based on the changes from the upstream repository, I'll be happy to merge it.