rendering/shader: Lighting broken on older GL implementations (NetBSD, Haiku)

[andreasdr]

Lighting seem to be broken in rendering when using older OpenGL implementations.
E.g. Haiku and NetBSD use MESA 10.x.y and Lighting is broken.

I checked if uniforms are set properly and could not find any error. Still something seem to go wrong in shader whereas compiling and linking do not fail.

If interessted check this video to see how the tests should look like:

• https://www.youtube.com/watch?v=2_24_NEdc0w&feature=youtu.be

[andreasdr]

I think I fixed this one

• andreasdr@27740f6

I need to validate still