Backport "expand classpath of pathing jars in scala_legacy command" to 3.5.1 (#21184)

Backports #21160 to 3.5.1-RC1 as a follow up to #21183

Author: WojciechMazur

dist/bin/scala_legacy

@@ -65,7 +65,7 @@ done
 # exec here would prevent onExit from being called, leaving terminal in unusable state
 compilerJavaClasspathArgs
 [ -z "${ConEmuPID-}" -o -n "${cygwin-}" ] && export MSYSTEM= PWD= # workaround for #12405
-eval "\"$JAVACMD\"" "${java_args[@]}" "-Dscala.home=\"$PROG_HOME\"" "-classpath \"$jvm_cp_args\"" "dotty.tools.MainGenericRunner" "-classpath \"$jvm_cp_args\"" "${scala_args[@]}"
+eval "\"$JAVACMD\"" "${java_args[@]}" "-Dscala.home=\"$PROG_HOME\"" "-classpath \"$jvm_cp_args\"" "-Dscala.expandjavacp=true" "dotty.tools.MainGenericRunner" "-classpath \"$jvm_cp_args\"" "${scala_args[@]}"
 scala_exit_status=$?