i965/vs: Fix types of varying outputs.

For structs/arrays/matrices, they were ending up as uint because we
forgot to set them.  All varyings in GLSL 1.20 are of base type float,
so just force the matter here (which gets inherited at
emit_urb_writes() time).

Fixes vs-varying-array-mat2-col-rd.

src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp

@@ -646,6 +646,7 @@ vec4_visitor::visit(ir_variable *ir)
       for (int i = 0; i < type_size(ir->type); i++) {
 	 output_reg[ir->location + i] = *reg;
 	 output_reg[ir->location + i].reg_offset = i;
+	 output_reg[ir->location + i].type = BRW_REGISTER_TYPE_F;
       }
       break;