Makefile common, let COPY_STATS add extra deps

If Makefile defines a need to copy over xdp_stats, when
create dependencies to common/xdp_stats_kern*.h.

Signed-off-by: Jesper Dangaard Brouer <[email protected]>

Author: netoptimizer

common/common.mk

@@ -65,6 +65,8 @@ ifdef COPY_STATS
 $(COPY_STATS): $(LOADER_DIR)/${COPY_STATS:=.c} $(COMMON_H)
 	make -C $(LOADER_DIR) $(COPY_STATS)
 	cp $(LOADER_DIR)/$(COPY_STATS) $(COPY_STATS)
+# Needing xdp_stats imply depending on header files:
+EXTRA_DEPS := $(COMMON_DIR)/xdp_stats_kern.h $(COMMON_DIR)/xdp_stats_kern_user.h
 endif
 
 # For build dependency on this file, if it gets updated