lib/Tools/scalac

adding some example that motivates some of the current changes in the set_comprehension_pointfree simproc

#!/usr/bin/env bash
#
# Author: Makarius
#
# DESCRIPTION: invoke Scala compiler within the Isabelle environment

[ -e "$ISABELLE_HOME/Admin/build" ] && { "$ISABELLE_HOME/Admin/build" jars || exit $?; }

CLASSPATH="$(jvmpath "$CLASSPATH")"
isabelle_scala scalac -Dfile.encoding=UTF-8 \
  "-Djava.ext.dirs=$(jvmpath "$ISABELLE_JAVA_EXT:$ISABELLE_HOME/lib/classes/ext")" "$@"