Correct the value of FAN_MARK_IGNORE

(apply <#3622> to `main`)
(cherry picked from commit 4128640)

Author: severen

src/unix/linux_like/linux/mod.rs

@@ -4579,7 +4579,7 @@ pub const FAN_MARK_IGNORED_MASK: ::c_uint = 0x0000_0020;
 pub const FAN_MARK_IGNORED_SURV_MODIFY: ::c_uint = 0x0000_0040;
 pub const FAN_MARK_FLUSH: ::c_uint = 0x0000_0080;
 pub const FAN_MARK_EVICTABLE: ::c_uint = 0x0000_0200;
-pub const FAN_MARK_IGNORE: ::c_uint = 0x0000_0100;
+pub const FAN_MARK_IGNORE: ::c_uint = 0x0000_0400;
 
 pub const FAN_MARK_INODE: ::c_uint = 0x0000_0000;
 pub const FAN_MARK_MOUNT: ::c_uint = 0x0000_0010;