Snippet of code for missing fopen$UNIX2003 and fwrite$UNIX2003

gcovr XCode fix

// Add to AppDelegate.h

#ifdef DEBUG
    FILE *fopen$UNIX2003(const char *filename, const char *mode);
    size_t fwrite$UNIX2003(const void *ptr, size_t size, size_t nitems, FILE *stream);
#endif


// Add to AppDelegate.m

#ifdef DEBUG
FILE *fopen$UNIX2003(const char *filename, const char *mode) {
    return fopen(filename, mode);
}

size_t fwrite$UNIX2003(const void *ptr, size_t size, size_t nitems, FILE *stream) {
    return fwrite(ptr, size, nitems, stream);
}
#endif