Correct an argument status of wait4 syscall for Linuxulator.

Forgot about i386.

MFC after:	1 week

sys/i386/linux/syscalls.master

@@ -208,7 +208,7 @@
 112	AUE_NULL	UNIMPL	idle
 113	AUE_NULL	STD	{ int linux_vm86old(void); }
 114	AUE_WAIT4	STD	{ int linux_wait4(l_pid_t pid, \
-				    l_uint *status, l_int options, \
+				    l_int *status, l_int options, \
 				    struct l_rusage *rusage); }
 115	AUE_SWAPOFF	STD	{ int linux_swapoff(void); }
 116	AUE_NULL	STD	{ int linux_sysinfo(struct l_sysinfo *info); }