We actually need this before the include of xutil.h, but
it was previously stuck randomly among various system
includes. Instead, put it at the top, right after include
the notmuch.h header that defines it.
#ifndef _GNU_SOURCE
#define _GNU_SOURCE /* For getline */
#endif
#ifndef _GNU_SOURCE
#define _GNU_SOURCE /* For getline */
#endif
#include <unistd.h>
#include <ctype.h>
#include <unistd.h>
#include <ctype.h>
#include <talloc.h>
#include "xutil.h"
#include <talloc.h>
#include "xutil.h"