Use memcpy instead of strncpy when we know the length anyway. Modern gcc seems to think it knows how to detect misuse of strncpy, but it's wrong (in fact: very, very wrong) and the path of least resistance is to not try to fight with it.

#define AAA <includes.h>
#define BBB "includes.h"
#define CCC(x) "includes.h"
#define DDD(x) #x

#include AAA
#include BBB
#include CCC(1)
#include CCC(includes.h)

#define includes wrong
#include "includes.h"
#include <includes.h>