Fix the light position transformation.
Fix the light position transformation.

OpenGL transforms the light position by the model-view matrix
at the time when that position is specified.

Bug 22124687

Change-Id: Ia6bb711c9eb20348faec45c46e45ee9f6ef92112
Reviewed-on: https://swiftshader-review.googlesource.com/3524
Reviewed-by: Nicolas Capens <0612353e1fcebbfd4b302d9337447ca0cdfa9122@google.com>
Tested-by: Nicolas Capens <0612353e1fcebbfd4b302d9337447ca0cdfa9122@google.com>

google/swiftshader,google/swiftshader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,google/swiftshader,bkaradzic/SwiftShader,bkaradzic/SwiftShader