sysctl.linux.in: use the --system option

According to the sysctl man page, the --system option causes sysctl to
process all system configuration files, which include the following:

/run/sysctl.d/*.conf
/etc/sysctl.d/*.conf
/usr/local/lib/sysctl.d/*.conf
/usr/lib/sysctl.d/*.conf
/lib/sysctl.d/*.conf
/etc/sysctl.conf

X-Gentoo-Bug: 484796
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=484796

init.d/sysctl.Linux.in

@@ -10,25 +10,7 @@ depend()
 
 start()
 {
-	local conf= retval=0 err errs
-
 	ebegin "Configuring kernel parameters"
-	eindent
-
-	for conf in @SYSCONFDIR@/sysctl.conf @SYSCONFDIR@/sysctl.d/*.conf; do
-		if [ -r "$conf" ]; then
-			vebegin "applying $conf"
-			if ! err=$(sysctl -p "$conf" 2>&1 >/dev/null) ; then
-				errs="${errs} ${err}"
-				sysctl -e -p "${conf}" >/dev/null
-			fi
-			veend $? || retval=1
-		fi
-	done
-
-	eoutdent
-	if [ ${retval} -eq 0 ] && [ -n "${errs}" ] ; then
-		ewarn "Unknown keys:${errs}"
-	fi
-	eend $retval "Some errors were encountered: ${errs}"
+	sysctl --system
+	eend $? "Unable to configure some kernel parameters"
 }