mesa: simplify _mesa_Lightfv
mesa: simplify _mesa_Lightfv

Signed-off-by: Thomas Faller <92e4eef067a10d07b4dbd4b54c2b31e20dda1cc4@gmx.de>
Reviewed-by: Brian Paul <3cb4e1df5ec4da2c7c4af7c52cec8cf340a55a10@vmware.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler