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adds linux makefile

#include <stdio.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <limits.h>
#include <aitmqtt.h>

int
main(int argc, char **argv)
{
	unsigned int x;
	unsigned char *p = (unsigned char*) &x;
	int s;

	if (argc < 2)
		return 1;
	else
		x = strtol(argv[1], NULL, 0);

	printf("decode:: (wire)-> %02x %02x %02x %02x ", p[0], p[1], p[2], p[3]);
	x = mqtt_decodeLen(&x, &s);
	printf("length is x=%u sizeof=%d\n", x, s);

	return 0;
}