bumpmapping example uses GLSL #version 410 but uses 4.2 binding syntax.

[Dingobloo]

https://github.com/openglsuperbible/sb6code/blob/master/bin/media/shaders/bumpmapping/bumpmapping.fs.glsl

and

https://github.com/openglsuperbible/sb6code/blob/master/bin/media/shaders/bumpmapping/bumpmapping.vs.glsl

Both have #version 410 core at the top but use binding syntax that according to https://www.opengl.org/wiki/Sampler_(GLSL)#Version_4.20_binding is only for OpenGL 4.2 or later causing it to fail to compile on nvidia and not render.

Simple fix, bump the version to 420 core.

[genpfault]

Bumping to 420 kinda leaves macOS in a lurch, doesn't it? Even Mojave doesn't seem to support ARB_shading_language_420pack, at least on this Macmini6,1.