syscalls: Introduce sys_kcmp syscall

Though we can use libc's syscall() wrapper
I would prefer to have own implementation
in case if we will need it in non-libc bindable
code.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Pavel Emelyanov <xemul@parallels.com>

include/types.h

@@ -182,4 +182,17 @@ typedef struct {
 # define PAGE_SIZE	4096
 #endif
 
+/* For sys_kcmp */
+enum kcmp_type {
+	KCMP_FILE,
+	KCMP_VM,
+	KCMP_FILES,
+	KCMP_FS,
+	KCMP_SIGHAND,
+	KCMP_IO,
+	KCMP_SYSVSEM,
+
+	KCMP_TYPES,
+};
+
 #endif /* CR_TYPES_H_ */