mesa: remove unused MAT_INDEX_AMBIENT/DIFFUSE/SPECULAR contants

Reviewed-by: Roland Scheidegger <sroland@vmware.com>

src/mesa/main/mtypes.h

@@ -291,10 +291,6 @@ struct gl_config
 #define MAT_ATTRIB_SHININESS(f)(MAT_ATTRIB_FRONT_SHININESS+(f))
 #define MAT_ATTRIB_INDEXES(f)  (MAT_ATTRIB_FRONT_INDEXES+(f))  
 
-#define MAT_INDEX_AMBIENT  0
-#define MAT_INDEX_DIFFUSE  1
-#define MAT_INDEX_SPECULAR 2
-
 #define MAT_BIT_FRONT_AMBIENT         (1<<MAT_ATTRIB_FRONT_AMBIENT)
 #define MAT_BIT_BACK_AMBIENT          (1<<MAT_ATTRIB_BACK_AMBIENT)
 #define MAT_BIT_FRONT_DIFFUSE         (1<<MAT_ATTRIB_FRONT_DIFFUSE)