Fixes build with musl:
| ../git/src/shared/dissect-image.c: In function 'mount_image_privately_interactively':
| ../git/src/shared/dissect-image.c:2986:34: error: 'LOCK_SH' undeclared (first use in this function)
| 2986 | r = loop_device_flock(d, LOCK_SH);
| | ^~~~~~~
#include <linux/loop.h>
#include <sched.h>
#include <stdio.h>
+#include <sys/file.h>
#include <sys/mount.h>
#include <unistd.h>
#include <linux/fs.h>
#include <getopt.h>
#include <linux/loop.h>
#include <stdio.h>
+#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <linux/blkpg.h>
#include <linux/dm-ioctl.h>
#include <linux/loop.h>
+#include <sys/file.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <getopt.h>
#include <linux/loop.h>
+#include <sys/file.h>
#include <sys/mount.h>
#include <unistd.h>
#include <fcntl.h>
#include <linux/loop.h>
#include <pthread.h>
+#include <sys/file.h>
#include "alloc-util.h"
#include "dissect-image.h"