toolset: update Erlang from 17.4-2 to 18.2-2

toolset/setup/linux/languages/erlang.sh

@@ -5,7 +5,7 @@ RETCODE=$(fw_exists ${IROOT}/erlang.installed)
   source $IROOT/erlang.installed
   return 0; }
 
-VERSION="17.4-2"
+VERSION="18.2-2"
 RELEASE="trusty"
 ARCH="amd64"