glsl_to_tgsi: use TGSI array declarations for VS,GS arrays of outputs (v2)

v2: don't use PIPE_MAX_SHADER_ARRAYS

src/mesa/state_tracker/st_program.h

@@ -163,6 +163,7 @@ struct st_vertex_program
 
    /** Maps VARYING_SLOT_x to slot */
    GLuint result_to_output[VARYING_SLOT_MAX];
+   GLuint output_slot_to_attr[VARYING_SLOT_MAX];
    ubyte output_semantic_name[VARYING_SLOT_MAX];
    ubyte output_semantic_index[VARYING_SLOT_MAX];
    GLuint num_outputs;