fix update makefiles

src/core/lv_core.mk

@@ -8,6 +8,7 @@ CSRCS += lv_obj_draw.c
 CSRCS += lv_obj_pos.c
 CSRCS += lv_obj_scroll.c
 CSRCS += lv_obj_style.c
+CSRCS += lv_obj_style_gen.c
 CSRCS += lv_obj_tree.c
 CSRCS += lv_event.c
 CSRCS += lv_refr.c

src/misc/lv_misc.mk

@@ -11,6 +11,7 @@ CSRCS += lv_math.c
 CSRCS += lv_mem.c
 CSRCS += lv_printf.c
 CSRCS += lv_style.c
+CSRCS += lv_style_gen.c
 CSRCS += lv_timer.c
 CSRCS += lv_tlsf.c
 CSRCS += lv_txt.c