fix compile on nongki branch (#602)

* fix compile

* revert some edits

kernel/sucompat.c

@@ -15,6 +15,10 @@
 #include <linux/sched.h>
 #endif
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 1, 0) && !KSU_OPTIONAL_SELINUX_INODE
+#include "objsec.h"
+#endif // import inode_security_struct
+
 #include "allowlist.h"
 #include "feature.h"
 #include "klog.h" // IWYU pragma: keep