Inline the *_MAGIC defines to avoid a dependency on kernel_headers

switch_root.c

@@ -2,7 +2,6 @@
 #include <dirent.h>
 #include <fcntl.h>
 #include <limits.h>
-#include <linux/magic.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -12,6 +11,9 @@
 #include <unistd.h>
 #include "util.h"
 
+#define RAMFS_MAGIC		0x858458f6	/* some random number */
+#define TMPFS_MAGIC		0x01021994
+
 static void
 delete_content(const char *dir, dev_t curdevice)
 {