Decode fifth argument of mremap syscall

* mem.c (sys_mremap): Decode fifth argument.
* linux/*/syscallent.h: Update the number of mremap syscall arguments.
diff --git a/linux/arm/syscallent.h b/linux/arm/syscallent.h
index b9eac0f..9d7802b 100644
--- a/linux/arm/syscallent.h
+++ b/linux/arm/syscallent.h
@@ -191,7 +191,7 @@
 	{ 1,	0,	sys_sched_get_priority_min,"sched_get_priority_min"}, /* 160 */
 	{ 2,	0,	sys_sched_rr_get_interval,"sched_rr_get_interval"}, /* 161 */
 	{ 2,	0,	sys_nanosleep,		"nanosleep"	}, /* 162 */
-	{ 4,	0,	sys_mremap,		"mremap"	}, /* 163 */
+	{ 5,	0,	sys_mremap,		"mremap"	}, /* 163 */
 	{ 3,	0,	sys_setresuid,		"setresuid"	}, /* 164 */
 	{ 3,	0,	sys_getresuid,		"getresuid"	}, /* 165 */
 	{ 5,	0,	printargs,		"vm86"		}, /* 166 */