Implement kcmp syscall decoding

* kcmp.c: New file.
* Makefile.am (strace_SOURCES): Add it.
* linux/dummy.h (sys_kcmp): Remove stub alias.
* xlat/kcmp_types.in: New file.
diff --git a/Makefile.am b/Makefile.am
index f4271ad..92dbc10 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -82,6 +82,7 @@
 	ipc_sem.c	\
 	ipc_shm.c	\
 	ipc_shmctl.c	\
+	kcmp.c		\
 	kexec.c		\
 	keyctl.c	\
 	ldt.c		\