basic: introduce our own sys/mount.h implementation

To resolve conflict with sys/mount.h and linux/mount.h or linux/fs.h.

The conflict between sys/mount.h and linux/mount.h is resolved in
glibc-2.37 (774058d72942249f71d74e7f2b639f77184160a6), but our baseline
is still glibc-2.31. Also, even with the version or newer, still
sys/mount.h conflicts with linux/fs.h, which is included by
linux/btrfs.h.

This introduces our own implementation of sys/mount.h, that can be
simultaneously included with linux/mount.h and linux/fs.h. This also
imports linux/fs.h, linux/mount.h, and several other dependent headers.
The introduced sys/mount.h header itself may not be enough simple, but
by using the header, we can drop most of workarounds in other source files.

src/basic/efivars.c

@@ -3,7 +3,6 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
-#include <linux/fs.h>
 #include <stdlib.h>
 #include <sys/stat.h>
 #include <unistd.h>
@@ -18,6 +17,7 @@
 #include "io-util.h"
 #include "macro.h"
 #include "memory-util.h"
+#include "missing_fs.h"
 #include "stdio-util.h"
 #include "strv.h"
 #include "time-util.h"