Based on a patch by Bruno Jesus.

Spotted by Patrick Rudolph.

The application can override each material parameter with one of the two
FFP vertex color attributes. The 'ambient' struct field in the GLSL shader
can thus happen to be unused and the GL driver may optimize it away.

Emission is the OpenGL name, emissive the D3D one. Prefer the latter.

mshtml: Split getAttribute into helper function and use it in IHTMLDOMAttribute::get_nodeValue implementation.