kernel: move some defs to single file

* Much cleaner code, although setenforce is not used anymore
* Guard is_ksu_transition only for 4.19 and under.

Signed-off-by: rsuntk <rsuntk@yukiprjkt.my.id>

kernel/selinux/selinux.h

@@ -1,8 +1,8 @@
 #ifndef __KSU_H_SELINUX
 #define __KSU_H_SELINUX
 
-#include "linux/types.h"
-#include "linux/version.h"
+#include <linux/types.h>
+#include <linux/version.h>
 
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5, 10, 0)) || defined(KSU_COMPAT_HAS_SELINUX_STATE)
 #define KSU_COMPAT_USE_SELINUX_STATE
@@ -12,7 +12,7 @@ void setup_selinux(const char *);
 
 void setenforce(bool);
 
-bool getenforce();
+bool getenforce(void);
 
 bool is_ksu_domain();