tree-wide: include missing_fs.h only where necessary

The additional definitions provided by the header are
- EXT4_IOC_RESIZE_FS, used in resize-fs.c,
- FILEID_KERNFS, used in cgroup-util.c and pidfd-util.c.

Let's drop the inclusion at other places.

src/basic/chattr-util.h

@@ -1,8 +1,9 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 #pragma once
 
+#include <linux/fs.h>
+
 #include "forward.h"
-#include "missing_fs.h"
 
 /* The chattr() flags to apply when creating a new file *before* writing to it. In particular, flags such as
  * FS_NOCOW_FL don't work if applied a-posteriori. All other flags are fine (or even necessary, think

src/basic/fd-util.c

@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
 #include <fcntl.h>
+#include <linux/fs.h>
 #include <linux/kcmp.h>
 #include <sys/ioctl.h>
 #include <sys/resource.h>
@@ -16,7 +17,6 @@
 #include "fs-util.h"
 #include "log.h"
 #include "missing_fcntl.h"
-#include "missing_fs.h"
 #include "missing_syscall.h"
 #include "mountpoint-util.h"
 #include "parse-util.h"

src/basic/include/sys/mount.h

@@ -2,6 +2,7 @@
 #pragma once
 
 #include <features.h>
+#include <linux/fs.h>
 #include <linux/mount.h> /* IWYU pragma: export */
 #include <stddef.h>
 #include <stdint.h>
@@ -10,7 +11,6 @@
 #include <unistd.h>
 
 #include "missing_fcntl.h"
-#include "missing_fs.h"
 #include "missing_syscall_def.h"
 
 /* Possible value for FLAGS parameter of `umount2'.  */