common/Makefile: Add our own headers dir to the include path

We carry some copies of uapi headers in the headers/ dir, which were not
included from the Makefile in common/. Fix that.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>

Author: tohojo

common/Makefile

@@ -6,7 +6,7 @@ all: common_params.o common_user_bpf_xdp.o common_libbpf.o
 CFLAGS := -g -Wall
 
 LIBBPF_DIR = ../libbpf/src/
-CFLAGS += -I$(LIBBPF_DIR)/root/usr/include/
+CFLAGS += -I$(LIBBPF_DIR)/root/usr/include/  -I../headers
 # TODO: Do we need to make libbpf from this make file too?
 
 common_params.o: common_params.c common_params.h