Python headers are not needed to build, so remove python include path

Makefile

@@ -2,7 +2,7 @@ run: recvmmsg.so
 	python3 udp_receiver.py
 
 recvmmsg.so: recvmmsg.c
-	gcc -o recvmmsg.so recvmmsg.c -fPIC -rdynamic -shared -I/usr/include/python3.9 -O2
+	gcc -o recvmmsg.so recvmmsg.c -fPIC -rdynamic -shared -O2
 
 clean:
 	rm recvmmsg.so