Correct folder name for WITH_GIT_XDP option in makefile

packet-exchange/build/Makefile

@@ -31,7 +31,7 @@ ifneq ($(WITH_XDP),)
 CFLAGS += -D WITH_XDP
 LDFLAGS += -L/usr/lib -lbpf
 else ifneq ($(WITH_GIT_XDP),)
-CFLAGS += -D WITH_XDP -I$${HOME}/libbpf/src
+CFLAGS += -D WITH_XDP -I$${HOME}/libbpf/include
 LDFLAGS += -L$${HOME}/libbpf/src -lbpf
 endif