Disable insecure web operations (CVE-2017-7480).

Bug: https://bugs.gentoo.org/623150

--- a/rkhunter
+++ b/rkhunter
@@ -19462,7 +19462,7 @@
 	#
 
 	echo $ECHOOPT ""
-	echo $ECHOOPT "Usage: rkhunter {--check | --unlock | --update | --versioncheck |"
+	echo $ECHOOPT "Usage: rkhunter {--check | --unlock |"
 	echo $ECHOOPT "                 --propupd [{filename | directory | package name},...] |"
 	echo $ECHOOPT "                 --list [{tests | {lang | languages} | rootkits | perl | propfiles}] |"
 	echo $ECHOOPT "                 --config-check | --version | --help} [options]"
@@ -19518,10 +19518,8 @@
 	echo $ECHOOPT "                                       (Default level is $SYSLOG_DFLT_PRIO)"
 	echo $ECHOOPT "         --tmpdir <directory>          Use the specified temporary directory"
 	echo $ECHOOPT "         --unlock                      Unlock (remove) the lock file"
-	echo $ECHOOPT "         --update                      Check for updates to database files"
 	echo $ECHOOPT "   --vl, --verbose-logging             Use verbose logging (on by default)"
 	echo $ECHOOPT "     -V, --version                     Display the version number, then exit"
-	echo $ECHOOPT "         --versioncheck                Check for latest version of program"
 	echo $ECHOOPT "     -x, --autox                       Automatically detect if X is in use"
 	echo $ECHOOPT "     -X, --no-autox                    Do not automatically detect if X is in use"
 	echo $ECHOOPT ""
@@ -20396,9 +20394,6 @@
 	--unlock)
 		UNLOCK=1
 		;;
-	--update)
-		UPDATE=1
-		;;
 	--vl | --verboselogging | --verbose-logging)
 		VERBOSE_LOGGING=1
 		;;
@@ -20407,9 +20402,6 @@
 		echo "${PROGRAM_blurb}"
 		exit 0
 		;;
-	--versioncheck | --version-check)
-		VERSIONCHECK=1
-		;;
 	-x | --autox)
 		AUTO_X_OPT=1
 		AUTO_X_DTCT=1